KOSMA Instrument and Summary of Observations

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					     KOSMA: Instrument and
    Summary of Observations
          ISSI Workshop Submillimeter
            Solar Flare Observations,
             09.11.2009-11.11.2009

Thomas Lüthi, Leica Geosystems AG, Switzerland
(formerly Institute of Applied Physics, University of Bern, Switzerland)
                Contents
• Introduction
• KOSMA
• 12.04.2001: First Observation of a Solar
  Flare in the Submm-range with KOSMA
• BEMRAK
• Observations on 28.10.2003
Motivation for mm/submm
observations of solar flares
Observational Challenges
Instrumentation
KOSMA



    , T_n = 150/100 K
12.04.2001: First Observation of a Solar Flare in
       the Submm-range with KOSMA
Problem
Problem: Absolute Flux Density
         Calibration
Solution: Multibeam Receiver
Limitations
Beam Arrangement
BEMRAK (Bernese Multibeam
  Radiometer for KOSMA)
Reconstruction of Source Parameters
Determination of Source Size




          Limitation: Assumption of Gaussian source
Integration into KOSMA
BEMRAK Quasioptics
Beam Synthesis
28.10.2003: GOES X17.2 Flare
28.10.2003: GOES X17.2 Flare
28.10.2003: GOES X17.2 Flare
28.10.2003: GOES X12.7 Flare




Raulin et al., Meter to submillimeter observations of a
small flare in the decay of the GOES X 12.7 flare on 2003 October 28
COSPAR 2004
27.10.2003: Missed Impulsive Phase
           Acknowledgements
• University of Bern: Dr. Andreas Magun, Prof. Dr. Niklaus
  Kämpfer, Dr. Axel Murk, Dr. Andreas Lüdi, Daniel Weber
• University of Cologne: Dr. Martin Miller
• This research was funded by the Swiss National Science
  Foundation.
• The KOSMA 3 m radio telescope at Gornergrat-Süd
  Observatory is operated by the University of Cologne
  and supported by special funding from the Land
  Nordrhein-Westfahlen. The Observatory is administered
  by the Internationale Stiftung Hochalpine
  Forschungsstationen Jungfraujoch und Gornergrat,
  Bern.