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					STEREO
Michael L. Kaiser
STEREO Project Scientist
NASA/Goddard Space Flight Center


 May 2, 2008
 STEREO at 1.25 years
                      STEREO-B (BEHIND) OBSERVATORY
                                              SECCHI               1.1m X 2.0 m X 1.2 m
                                        Sun-Centered Imaging
                                         Package (SCIP) Assy       610 kg
                                      (COR-1, COR-2, EUVI, GT)
                                                                   ≥ 600 W



                                                                    PLASTIC Instrument



                                                      IMPACT SEP

                                                                   Deployed SWAVES
     SECCHI                                                       Electric Field Antenna
Heliospheric Imager                                                      (3 places)
       (HI)


                                        Deployed
                        IMPACT        IMPACT Boom
                       Magnetometer
                         (MAG)                      IMPACT
                                          Suprathermal Electron Detector
                                                     (STE)
                                                     IMPACT
                                       Solar Wind Electron Analyzer (SWEA)
                          STEREO Orbits
                                                          4 yr.
                                                                   3 yr.
                                          Ahead @ +22/year                2 yr.

                                                                                   1 yr.

          Sun                                    Sun
                                                                                      Earth


                         Ahead                                           1yr.
                 Earth                     Behind @ -22/year
                                 Behind                           2yr.
                                                 4 yr.   3 yr.



Heliocentric Inertial Coordinates         Geocentric Solar Ecliptic Coordinates
   (Ecliptic Plane Projection)                   Fixed Earth-Sun Line
                                              (Ecliptic Plane Projection)
                     STEREO Space Weather
                         Data Products
Research
 Highest resolution data – available 24-48 hrs
           SECCHI: 2048 X 2048 images
           IMPACT: fluxes (10s sec), moments (few sec) and B (<1 sec)
           PLASTIC: fluxes and moments 1 min resolution
           SWAVES: intensities from all frequencies (~367) every 15 sec


 Other data products – available TBD
           Key parameters
           Catalogs and event tables
           Movies



‘Operational’
 Beacon (space weather) data – available ‘immediately’
           SECCHI: ~7 256 X 256 images every hour
           IMPACT: 1 min aves of B, 1 min aves solar wind moments and selected SEP fluxes
           PLASTIC: 1 minute resolution selected moments and fluxes
           SWAVES: 1 minute summaries of alternate frequencies (0.1-16 MHz)

                http://stereo-ssc.nascom.nasa.gov/beacon/
SECCHI
IMPACT/PLASTIC
IMPACT SEP
                  Beacon Status
• Receive beacon telemetry from England, Japan,
  and France on a regular basis – overall coverage
  50-90%
  – Toulouse station recently added
  – Not certain about continued funding for station in England
  – Wallops tracking is top priority—paperwork is main delay
  – NOAA examining link margins for extended mission

• All SECCHI telescopes are now included in the
  beacon pages.
• SWAVES radio plots are now generated in
  realtime.
March 25, 2008 – Our first big success
                 Eruption in the Low Corona
• A-B separation = 28 deg
• Cadence = 10 min
• Mild wavelet enhancement
Eruption in the Low Corona (Implications)
                           •Visibility of prominence top
                            depends on projection
                                – Gap of several hours between A &B.
                                – Height-time analyses of eruptive
                                  prominences from single viewpoint are
                                  unreliable for CME studies!


                           •The existence of kinked
                            structures is projection-
                            depended
                               – “kinked” structure seen in B, not A
                               – Footpoints of eruptive prominence seen in
                                 B, not A
                               – Shape, configuration of erupting structures
                                 is very uncertain from single viewpoint.



                Kinked structures
STEREO Actually ‘sees’ CIRs
STEREO into cycle 24




                 90°   180
                       °
               STEREO separation
 http://stereo.gsfc.nasa.gov
              or
http://www.nasa.gov/stereo

				
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posted:10/18/2012
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