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Ground Based Observatories Mission PDR

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					                     Ground Based Observatories
                               (GBO)
                            Mission PDR

                                    S. B. Mende
                                      S. Harris
                         University of California - Berkeley




THEMIS Mission PDR/CAR                   1                     UCB, November 12-14, 2003
                                                  Overview

GBO PDR - Stewart Harris
      •    Introduction to GBO
      •    Requirements
            – Science Objective
            – Derived Requirements
            – Implementation
      •    GBO Site Location and Design
      •    Design
            – Instrument Design (ASI and GMAG)
            – Observatory Equipment
      •    Deployment Plans and Status
      •    Results from Engineering Peer Review

Canadian Collaboration – Eric Donovan


THEMIS Mission PDR/CAR               2             UCB, November 12-14, 2003
                                          GBO Team Institutions

University of California – Berkeley (UCB)
      •    S. B. Mende – GBO science lead
      •    Provides ASI development, system engineering, GBO system
           fabrication and construction, data archive and dissemination
University of California – Los Angeles (UCLA)
      •    C. T. Russell – magnetometer science lead
      •    Develop and provide ground magnetometer for GBO / EPO
University of Calgary
      •    E. Donovan – Canadian science lead
      •    Providing GBO system deployment in Canada, field management,
           data collection, development participation
University of Alberta
      •    I. Mann – magnetometer scientist
      •    Providing access to Canadian magnetometer network



THEMIS Mission PDR/CAR                3                     UCB, November 12-14, 2003
                                                                    UCB Organization

                                     GBO / UCB Organization

                                      GBO Lead Co-Investigator
                                                S. B. Mende
                                                510-642-0876
                                                                                   Administrator
                                                                                    Ya Ling Zhu
                                                                                    510-643-5176
                                           Project Manager
                                                S. Harris
                                              510-643-3395




                   System Eng.                             Mechanical                    Software
                         S. Harris                          G. Dalton                    S. Geller



   Test & Verif.                     Electrical Test                    Assembly
      H. Frey                             TBD                           B. Dalen




THEMIS Mission PDR/CAR                                 4                           UCB, November 12-14, 2003
                                                           UCLA Organization


                              GBO/EPO Magnetometer Organization


                                       Lead Co-Investigator
                                           C. T. Russell
                                           310-825-3188
              R & QA                                                       Business Office
            D. Dearborn                                                       J Nakatsuka
            310-825-1488                                                      310-825-3939
                                        Program Manager
                                             D. Pierce
                                           775-588-0356




Magnetics                  Analog          Mechanical            Digital                    Assembly
 R. Snare                  D. Pierce         G. Barr           D. Dearborn                   W. Greer




  THEMIS Mission PDR/CAR                        5                            UCB, November 12-14, 2003
                         GBOs: A synoptic view of the aurora

                                                   Global auroral
                                                   image taken by
                                                   IMAGE WIC.
                                                   Proposed THEMIS
                                                   GBO sites
                                                   superimposed.




THEMIS Mission PDR/CAR           6                 UCB, November 12-14, 2003
                                         GBO Science Objective


GBO shall monitor the auroral light and ionospheric currents across North
America in order to localize the time, location, and evolution of the auroral
manifestation of the substorm.


Themis mission requirement relating to GBO: Determine substorm
onset time and substorm meridian magnetic local time (MLT) using All Sky
Imagers (one ASI per MLT hr) and Ground Magnetometer (two GMAG per
MLT hr) with t_res<30s and dMLT<6° respectively, in an 8hr geographic
local time sector including the US.
Note: dMLT < 6° is minimum requirement, while dMLT < 1° is baseline
specification.




   THEMIS Mission PDR/CAR            7                    UCB, November 12-14, 2003
                                        GBO Derived Requirements
    Requirement                                     Performance
 1. Shall cover 8 hrs of Geographic Local Time      Covers 10 hrs of Geographic LT with ASIs,
    over North American segment (allows             14 hrs with GMAGs incl. Non-Themis
    continuous 12 hr conjunctions with              Contributions
    probes)
 2. Shall include at least one ASI per MLT          Two ASIs per hour (MLT)
    hour within this geographic segment
 3. Shall include two auroral GMAG per hour         More than two GMAGs per hour (MLT)
    (MLT) (high/low lat.) within this segment.      (New + existing)

 4. Timing accuracy of phenomena observed           1s ASI exposures. Cadence: 0.5s GMAG,
    shall be better than 10s absolute               3 -5s ASI. Accuracy: <50 ms (GPS)
 5. ASI sensitivity: Detectable response for        < 1kR (5:1 S/N ratio)
    aurora shall be < 10kRayleigh
 6. Sensitivity of GMAG instrument shall be         0.1nT
     < 1nT
 7. The spatial resolution shall be sufficient to   ASI data compressed data (Stream 1)
    locate the substorm brightening with an         provides 0.5° sampling.
    accuracy of 100km (dMLT < 1°)


THEMIS Mission PDR/CAR                         8                       UCB, November 12-14, 2003
                              Implementation Requirements


GBO Program Implementation:
      •    Integrate ASI from UCB, GMAG from UCLA with site prep
           and deployment provided by U. Calgary
      •    Build, calibrate and qualify first unit within one year after
           start of Phase B
      •    Five sites shall be installed two winters before THEMIS
           launch
      •    Total GBO installed network shall be 20 sites, installed one
           winter before THEMIS launch




THEMIS Mission PDR/CAR               9                    UCB, November 12-14, 2003
                                 GBO Site Locations




IMAGE FUV substorm onset identification.



THEMIS Mission PDR/CAR     10               UCB, November 12-14, 2003
                                               GBO Site List - Today

                    Site             Abbrev.              Lat            Lon
           1        Gakona           (GAK)         US    63.15          267.03
           2        Fort Yukon,AK    (FYU)         US    67.32          263.82
           3        Mcgrath,AK       (MCGR)        US    61.72           258
           4        Kiana            (KIA)         US    65.05          251.51
           5        Inuvik           (INUV)        CA    68.30          226.70
           6        white horse      (WHOR)    +   CA    60.72          224.95
           7        contwoyto lake   (CONT)        CA    65.75          248.75
           8        fort simpson     (FSIM)        CA    61.76          238.77
           9        prince george    (PGEO)        CA    53.90          237.41
          10        rankin inlet     (RANK)        CA    62.82          267.89
          11        fort smith       (FSMI)        CA    60.02          248.05
          12        athabasca        (ATHA)        CA    54.72          246.72
          13        gillam           (GILL)        CA    56.38          265.36
          14        flin flon        (FLIN)    +   CA    54.77          258.14
          15        pinawa           (PINA)        CA    50.25          263.96
          16        pbq              (PBQ)         CA    55.28          282.26
          17        kapuskasing      (KAPU)    +   CA    49.42          277.57
          18        hebron           (HEBR)    +   CA    58.15          297.25
          19        gangon           (GANG)    +   CA    51.89          291.83
          20        cartwright       (CART)    +   CA    53.70          302.98

THEMIS Mission PDR/CAR                   11                      UCB, November 12-14, 2003
                                         Observatory Design


Major components:
      •    Science Instruments:
            – All Sky Imager (ASI)
            – Ground Magnetometer (GMAG)
            – GPS
      •    Observatory Equipment
            – Communications
            – Environment Control
            – System Computer




THEMIS Mission PDR/CAR              12              UCB, November 12-14, 2003
                                               GBO Components


                      All Sky                  Iridium
                                                                          Internet
                      Imager
                                       GPS




                                                                     Telesat Dish



                  Computer Enclosure
                                                    GMAG
                                        AC
Variations possible at some sites:     Power

    Existing magnetometer
    Enclosures not needed
    Existing Internet connection
     THEMIS Mission PDR/CAR              13                UCB, November 12-14, 2003
                                                     The Environment




                               Summer         and Winter




                         USGS Tundra monitoring site Alaskan Tundra

THEMIS Mission PDR/CAR                   14                           UCB, November 12-14, 2003
                                          Expected Temperatures


Alaska (Poker Flat)                           Southern Canada (Winnipeg)
     •    Highest max: +35º C (1919)             •   Highest max: +42º C
     •    Lowest min: -54º C (1934)              •   Lowest min: -44º C

     •    Normal max: +23º C (1 Jul)
     •    Normal min: -28º C (31 Jan)




                      “Reasonable” Design Range: -50º to +40º C




  THEMIS Mission PDR/CAR                 15                   UCB, November 12-14, 2003
                                 All Sky Imager

Overview:
      •    Design
      •    Specifications
      •    Interface
      •    Data Products




THEMIS Mission PDR/CAR      16         UCB, November 12-14, 2003
                                           All Sky Imager Heritage


               • Environmental protection/deployment and
                 automation drawn from AGOs (flawless multi-year
                 operation in Antarctica).
               • Prototype camera field tested in Canada
                     – Demonstrated high cadence, high sensitivity
                     – Taking 5s images




THEMIS Mission PDR/CAR                    17                   UCB, November 12-14, 2003
                                           ASI Enclosure

 External                  Internal                 Pipe Clamp
Construction             Construction                 Shown




                                         Design concept: Allison Park Group, Inc.

THEMIS Mission PDR/CAR              18                UCB, November 12-14, 2003
                                                                 Sun Shade Design
                                                         All Sky Lens




     Retracted                                                                                Closed
     (Fail-safe)                                                                              Position
      Position




Drivers:
     •     ASI must survive, without degradation, non-operating exposure to daytime sun
           exposure
     •     CCD is Sony Interline Transfer device ICX249AL
           –    Features “microlens” on each pixel, an organic material subject to deterioration due to UV
                exposure
     •     All Sky Lens uses Peleng Fisheye f/3.5
           –    A/R coating exhibited discoloration after one summer in Athabasca

THEMIS Mission PDR/CAR                              19                                 UCB, November 12-14, 2003
                                                     ASI Specifications

Imager:
      •    Field of View: 170º full angle
      •    Spectral passband: 400 – 700 nm (with IR filter)
      •    Sensitivity: < 1kR (5:1 S/N)
      •    Spatial resolution: 290 pixel diameter all-sky-image
      •    Exposure duration: programmable, 1 sec typical
      •    Cadence: 5 s demonstrated, 3 s appears feasible
Enclosure:
      •    Operate in external ambient –50º to +40ºC
      •    Maintain internal temperature at 20º ± 10ºC
            –    Requires about 150 W heating
      •    Hermetically sealed unit w/ nitrogen purge
            –    Dessicant used for field repair
            –    Hermetically sealed electrical connectors
      •    Polycarbonate/acrylic dome
      •    Flexible mounting

THEMIS Mission PDR/CAR                     20                  UCB, November 12-14, 2003
                                                                          ASI Electrical Interface

         Electrical:
                  •     Two connectors: Data and Power

                        ASI Power Interface                                                   ASI Data Interface
#    Signal           I/O      Description                                #    Signal       I/O      Description
1    CAM_P12V         Output   Camera DC power                            1    USB_VBUS     Output   USB DC power service, nominally +5V
2    TEC_CUR          Output   Camera TEC constant current supply         2    USB_GND      Output   USB DC return
3    CAM_RTN          Output   DC return                                  3    USB_D+       In/Out   USB signalling pair, USB type 1
4    CAM_SHIELD       Output   Power shield                               4    USB_D-       In/Out   USB signalling pair, USB type 1
5    HEAT_VAC         Output   Heater power, nominally 120VAC (hot)       5    USB_SHIELD   Output   USB cable shield
6    HEAT_RTN         Output   Heater power, nominally 120VAC (neutral)   6    CAT5_TSA+    In/Out   contingency - CAT5 pair 3
7    GND              Output   Safety ground, earth                       7    CAT5_TSA-    In/Out   contingency - CAT5 pair 3
8    TEMP_A           Input    Themistor, 2-wire                          8    CAT5_TSB+    In/Out   contingency - CAT5 pair 4
9    TEMP_B           Input    Themistor, 2-wire                          9    CAT5_TSB-    In/Out   contingency - CAT5 pair 4
10   SUN_CNTL+        Output   Sun shield solenoid, power +               10   Spare
11   SUN_CNTL-        Output   Sun shield solenoid, power -               11   Spare
12   Spare                                                                12   Spare




        Physical:
              •        Hermetically sealed, O-ring closure on housing
              •        Stainless steel shell
              •        Weatherproof

         THEMIS Mission PDR/CAR                                      21                               UCB, November 12-14, 2003
                                   ASI Data Products

                         • ASI primary image 290 pixel diameter is
                           “binned” to 0.5° resolution (thumbnails)
                         • Primary science data:
                                 Stream #1 (~ 1kbps)
                                 (incl GMAG, housekeeping)

                         • Available via SAT comm, either Telesat
                           (Internet real-time) or Iridium (daily)


                         • High resolution data:
                                 Stream #2 (180 kbps)
                         • Selective downloads via Telesat/Internet
                         • Periodic backups via disk swapping




THEMIS Mission PDR/CAR     22                      UCB, November 12-14, 2003
                                   ASI Data Products

                         • ASI primary image 290 pixel diameter is
                           “binned” to 0.5° resolution (thumbnails)
                         • Primary science data:
                                 Stream #1 (~ 1kbps)
                                 (incl GMAG, housekeeping)

                         • Available via SAT comm, either Telesat
                           (Internet real-time) or Iridium (daily)


                         • High resolution data:
                                 Stream #2 (180 kbps)
                         • Selective downloads via Telesat/Internet
                         • Periodic backups via disk swapping




THEMIS Mission PDR/CAR     23                      UCB, November 12-14, 2003
                                Ground Magnetometer

Overview:
    •    Specifications
    •    Design
    •    Data Products
    •    Software
    •    GBO & E/PO




  THEMIS Mission PDR/CAR   24               UCB, November 12-14, 2003
                                         Ground Magnetometer Drivers


Level     Requirement                             Capability                           Comply?

L1        Onset times to <30s                     Sample rate 2 Hz                       Yes

L1        Determine onset locations               Over 30 MAG sites                      Yes

--        Current disruption latitudes            Churchill chain ~1 o spacing           Yes

--        Identity PiB occurrences                Sample rate 2 Hz; Res. 0.03 nT         Yes

L4        Measure ± 2000 nT                       Range ± 72,000 nT                      Yes

L4        Resolve ±1 nT                           Resolution 0.03 nT (22 bits)           Yes

L4        Provide 1s time resolution              Sample rate 2 Hz                       Yes

L5        Survive arctic winter conditions        Sensors operate at -170 o C            Yes

L5        Maintain orientation <5 o               Seasonal tilting <5 o                  Yes




THEMIS Mission PDR/CAR                       25                             UCB, November 12-14, 2003
                           Magnetometer – GBO Design


                         Sub-System Features
  GPS Receiver
       Antenna and Electronics Integrated into one package
       May be located >30M from host (RS232 signals)
       NTP compatible (<1msec time accuracy)
  Flxugate Magnetometer
       ±72KnT dynamic range @ 0.03nT Resolution (~22 bits)
       Offset DAC system for 72 4KnT ranges per axis
       2 Vectors per second data rate
       Low Power < 2W
       Small Size 22cm x 13cm x 5cm
       Ruggedized All Weather Sensor Design
       USB interface for data retrieval and firmware upload




THEMIS Mission PDR/CAR          26                   UCB, November 12-14, 2003
                                       GMAG System Overview




                GPS Receiver                RS232 bidirectional


                 Up to 30M
                cable length
                                             USB Interface
                                                                  GBO Data System

RS232 bidirectional
                                        Power Control                  To Power Supply
                                                                                 12VDC

  Survival Heater and
      Thermistor                     Antenna Heater                               Up to 50M
                        GPS Power                                                cable length
                                    GMAG Interface                To Fluxgate Sensor




      THEMIS Mission PDR/CAR           27                          UCB, November 12-14, 2003
                                                   GMAG Sensor


                                        ~100cm




                         Ground Magnetometer Fluxgate Sensor


THEMIS Mission PDR/CAR                  28                UCB, November 12-14, 2003
                                    GMAG Data Files



Data Inputs Include:
    Configuration File      (UCLA_GBO_ssss_Vxx_xx.INI)
    uP Firmware File        (UCLA_GBO_ssss_Vxx_xx.UPF)
    FPGA Firmware File      (UCLA_GBO_ssss_Vxx_xx.GAF)
Data Outputs Include:
    Mag Vector Data         (ssssdddddd_MAG_hh_cc.RMD)
    Mag Housekeeping Data   (ssssdddddd_MAG_hh_cc.HKD)
    Magnetometer Log Data   (ssssdddddd_MAG_hh_cc.LOD)
    Mag Calibration Data    (UCLA_GBO_ssss_Vxx_xx.CAL)




 THEMIS Mission PDR/CAR      29                UCB, November 12-14, 2003
                                                 GMAG Software


 Magnetometer Setup using LabView Program
      Real time display of three axis time series data
      Real time display of three axis Power Spectra
      Operator control of Mag. settings (Heaters, Offset DACs, modes)
 Autonomous Operations using C++ Program
      Command Line execution
       Initialization controlled via Configuration file




THEMIS Mission PDR/CAR               30                    UCB, November 12-14, 2003
                                          GMAG Deployment


UCLA Deliveries:
      •    20 Magnetometers: 10 E/PO, 8 GBO, 2 Spares
Schedule for GBO:
      •    1 prototype delivered Winter „03
      •    5 in Fall ‟04
      •    5 in Fall ‟05
Schedule for E/PO:
      •    5 in Summer ‟04
      •    5 in Summer „05




THEMIS Mission PDR/CAR             31              UCB, November 12-14, 2003
                            Observatory Infrastructure


Overview:
   •   Provides Data        “Box within a Box”
       Collection                                             Internal Rack
                                                                Mount for
   •   Data Access                                              Equipment
   •   Environmental                                         (Doubles as
       Protection                                           Shipping Case)
        – Heating & A/C
        – Smart Power
          Control
                                                                 External
        – Remote
                                                                Insulated
          Intervention                                        Environmental
                                                                Enclosure
                                                             (Provided where
                                                                 required)



   THEMIS Mission PDR/CAR     32                 UCB, November 12-14, 2003
                                                         Internal Components

                                                                               Front View


Elements include:
   •       Data collection computer H/W
            –    Hot swap HDD (2)                                          Shelf Space for Monitor/Keyboard



   •       Environment controller                                 Computer (Databrick III)              Hot Swap USB Drives



                                                                                                          Ground Mag I/F
   •       Communications equipment                          Temperature Controller
                                                                   CR10X

            –    Telesat / Starband prime chan.   28.0
                                                                                   Serial Port Switch
            –    Iridium backup channel                                            Modems
                                                                              Iridium / Telesat

   •       Power conditioning

                                                                                                                     UPS

                                                                    AC switched outlets /
                                                                     DC power supplies




       THEMIS Mission PDR/CAR                     33                                        UCB, November 12-14, 2003
                                           Observatory Specifications

Requirements:                                    Performance:
      •    Unattended operation                      •   Will operate for 12 mo / yr
           minimum 4 mo/observing
           season
      •    Support digital I/F and data              •   Supports USB / Serial /
           storage ASI & GMAG                            10BaseT
      •    Provide GPS for time sync and             •   GPS part of GMAG system
           location calibration
      •    Provide means for daily uplink            •   Internet connectivity will
           of “Stream 1” data                            provide real-time transfer -
                                                         Iridium backup sys. will meet
            –    Total transfer requires
                                                         basic requirement
                 about 3MB per day
      •    Shall store high resolution               •   All data stored on hot swap
           “Stream 2” locally                            USB drives, Internet
            –    Hot swappable drives –                  connectivity provides selective
                 requires ~ 24GB per                     download of high res data in
                 month                                   near real-time

      •    Compatible with local power               •   UPS provides 1 hour backup
                                                         and power conditioning


THEMIS Mission PDR/CAR                      34                        UCB, November 12-14, 2003
                                                       Environment Control


Design Approach
      •    Provide environment inside Computer Enclosure to enable use of
           commercial hardware for computer, USB hard drives,
           Telesat/Starband gear, etc.
             –   All equipment must survive non-operating cold soak in event of power
                 loss (qualification test)
             –   Temperature control must allow for warm up of sensitive components
                 prior to re-boot
      •    Select “Smart” controller vs Thermostat approach
             –   Two level control of graceful shutdown: low temp and/or loss of power
             –   Programmable with remote access via Iridium
             –   Provides remote control and query
             –   Extended temperature range (-55º to +85ºC)
                   –     Always operating and accessible
             –   Low power (battery can operate it for months)
             –   Maintains internal temperature at 20º ± 10º C
      •    Provide “dust-free” method of cooling when required



THEMIS Mission PDR/CAR                          35                  UCB, November 12-14, 2003
                                                Heating / Cooling

                                   “Smart” Controller
Silicon Rubber                     Extended Temp. Operation (-55º to +85ºC)
Heat Blankets




                                            Solid State Air
                                            Conditioner
         Heating / Cooling Needs
         Required    Provided
Heating: 165 W       400 W
Cooling: 80 W        165 W


  THEMIS Mission PDR/CAR             36                       UCB, November 12-14, 2003
                         Environmental Enclosure




THEMIS Mission PDR/CAR   37              UCB, November 12-14, 2003
                                          Remote Intervention


Two Levels:
      •    Typically GBO accessed via Internet
            – Canada: Telesat HSi (100k – 10kbps uplink)
            – Alaska: Starband 480Pro (100kbps uplink)
      •    Under duress, Back up communication via Iridium
            – 2400 bps




THEMIS Mission PDR/CAR              38                     UCB, November 12-14, 2003
                                                Instrument Data Flow


        ASI                         System                      Hot Swap
                                   Computer                       Hard
                                                                 Drive(s)




      GMAG                                                       Telesat
                         GPS                                     Modem




                                        USB

                                   Serial I/O
                               10/100 Base T

                                                                            Internet


THEMIS Mission PDR/CAR                    39                UCB, November 12-14, 2003
                                           Test and Deployment

Lab testing where necessary and possible
      •    Cold limit testing of commercial components
Get in the field early and often
      •    Establish network of GBOs well before satellites launched
      •    “Full-up” prototype to be deployed this winter
            – Plus 5 “ASI-only” installations in Canada
      •    5 “Full up” Units deployed in winter ‟04-05
      •    All 20 Units deployed by winter ‟05-06
Test and verification of each installation planned
      •    Configuration, functional, performance verification
      •    Burn-in
“Hot” spares available for all components
      •    Located at Calgary and UCB
      •    On-site custodians for each station


THEMIS Mission PDR/CAR                40                  UCB, November 12-14, 2003
                                                                                                                  Schedule

     Revision Date: 10/10/03                                      2003                2004               2005               2006               2007
ID   Task Name                              Start       Finish     Q1 Q2   Q3    Q4    Q1 Q2   Q3   Q4    Q1 Q2   Q3   Q4    Q1 Q2   Q3   Q4    Q1
 1   Ground Based Observatories              05/01/03    07/22/09
 2      Prototype Instrument Devel.          05/01/03    10/16/03
 3      Gnd. Based Instrument PDR            10/17/03    10/17/03
 4      Prototype Instrument Constr.         10/01/03    01/05/04
 5      Add'l ASI deployed in Canada         12/01/03    05/30/04
 6      Field Testing of Prototype           01/05/04    05/30/04
 7      Ordering of Parts for field          10/01/03    05/30/04
 8
 9      Gnd. Based Instrument CDR           03/25/04    03/25/04
10      Construct first lot 5 field units   03/25/04    11/01/04
11      Lab Test first 5 field units        08/01/04    11/01/04
12      Delivery first 5 field units        11/01/04    11/01/04
13
14      Construct 2nd lot of 15 field units 01/03/05 07/01/05
15      Lab Testing of 2nd 15 field units 07/01/05 09/30/05
16      Delivery of 15 field units          10/03/05 10/03/05
17
18      Operating 1-5 GBO stations          11/01/04 04/01/05
19      Operating all 20 GBO stations       10/03/05 04/01/06
20
21      Instrument S/W development          05/01/03    01/05/04
22      Central server and data archive     07/01/03    11/01/04
23      Data analysis S/W developmt.        07/01/03    09/30/06
24      First Data on the Web               07/01/03    07/01/03
25
26      Magnetometer I/F developmt.         05/01/03    10/16/03
27      Magnetometer I/F review             10/16/03    10/16/03
28      Magnetometer prototype              01/05/04    01/05/04
29      Magnetometer field unit eval.       01/05/04    05/30/04
30
31      Flight operations 1                 10/02/06    03/01/07
32      Flight operations 2                 10/01/07    02/29/08
33      GBO station operations              10/03/05    02/29/08
34      Operating the home base             10/03/05    02/29/08
35      Data Analysis                       01/02/06    07/22/09

     THEMIS Mission PDR/CAR                                                     41                                     UCB, November 12-14, 2003
                                       Results from Peer Review

Comments from reviewers were positive:
      •    “review was conducted with quality information”
      •    “details of the system were well engineered”
      •    “detailed consideration of environmental accommodation”
      •    “Success is likely given the proposers‟ excellent experience and track
           record.”
      •    “likely to accomplish not only the THEMIS mission, but also provide a
           wealth of data for auroral research in general.”
      •    “applaud the team for their emphasis on a web based real time delivery
           of…data”
      •    “Overall plan and direction seems good.”
      •    “Early deployment, beginning this coming winter, is good idea”


Reviewers also provided several recommendations…




THEMIS Mission PDR/CAR                   42                        UCB, November 12-14, 2003
                                                Peer Review Action Status, 1

            Request / Recommendation                 Impact / Discussion                     Status
          1 Synchronize ASI exposures (5s            Given GPS accuracy, can be              Will comply
            cadence) across entire network to        implemented with software change.
            100ms                                    Minimally complex.
          2 Generate a Keogram (1min res.) from Increases daily processing load on           Will comply
            high resolution images on a daily basis system computer at each site. Low
                                                    impact.
          3 Generate a sky clarity index to aid      Several approaches are under            On-going
            image interpretation.                    investigation.                          analysis


          4 Bury exposed cables, as safety           Great idea.                             Will comply
            precaution and protection from
            animals.
          5 Find local caretakers. It will be        This is planned. Local custodians are   Will comply
            difficult (and expensive).               REQUIRED, to perform routine
                                                     maintenance, e.g. snow removal.
          6 Be prepared, at remote sites, for        Requires UPS and power conditioning, Will comply
            power of low quality, frequent           but ultimately, individual GBO will be
            outages, variations in voltage / freq.   off-line during extended power outage.




THEMIS Mission PDR/CAR                               43                                 UCB, November 12-14, 2003
                                            Peer Review Action Status, 2

            Request / Recommendation               Impact / Discussion                       Status
          7 Maintain formal log giving station     This is planned. Implementing             Will comply
            status, configuration, caretaker       caretaker database will require
            interventions, etc.                    manual data entry.
          8 Plan now for selective transfer of high This has been recognized as highly       Will comply
            resolution data.                        desirable from the beginning.


          9 Increase thermal capacitance of     This also has been recognized as         Will comply
            enclosures to slow down temperature highly desirable, and part of the design
            loss during power outage.           consideration.
         10 * Establish System Requirements        GBO requirements are currently            Will comply
            Specification document                 included in THEMIS MRD


         11 * Establish Systems Interface          Interfaces with ASI, GMAG,                Will comply
            Specifications document                communications, power, data center
                                                   will be included.
         12 * Establish System Test Plan           Test and verification of each             Will comply
            document                               installation is planned, in addition to
                                                   qualification testing.


            * Request for Action




THEMIS Mission PDR/CAR                              44                                   UCB, November 12-14, 2003

				
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