High-temperature solar flare plasma behaviour from crystal spectrometer observations

We present results of analysis of the spectra collected with Polish instrument RESIK flown on CORONAS-F satellite. RESIK was the bent crystal spectrometer, measuring spectra in the spectral range 3.3 - 6.1 Å with a high cadence during flares. The emission lines as well as the continuum observed by R...

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Bibliographic Details
Published in:Proceedings of the International Astronomical Union 2015-08, Vol.11 (S320), p.80-85
Main Authors: Sylwester, Barbara, Sylwester, Janusz, Phillips, Kenneth J.H., Kepa, Anna, Mrozek, Tomasz
Format: Article
Language:English
Subjects:
Analysis
Astronomy
Continuums
Contributed Papers
Crystals
Emission analysis
Flares
Plasma
Pollution sources
Satellite-borne instruments
Sensors
Solar flares
Spectra
Spectrometers
Studies
Sun
X-rays
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Summary:We present results of analysis of the spectra collected with Polish instrument RESIK flown on CORONAS-F satellite. RESIK was the bent crystal spectrometer, measuring spectra in the spectral range 3.3 - 6.1 Å with a high cadence during flares. The emission lines as well as the continuum observed by RESIK are formed in hotter (T > 3 MK) plasmas of active regions and flares. RESIK observed various types of flares: from X-ray class B and C up to strongest flares of X-class, for both, short and long duration events. The analysis of absolute and relative spectral intensities of the lines and continuum observed for 33 events allowed for determining the plasma elemental composition with subsequent detailed study of time changes of the temperature structure of the sources described in terms of the differential emission measure (DEM). As an example we present the typical DEM evolutionary patterns for the C1.9 flare (SOL2002-12-26T08:35) and discuss its thermodynamics.
ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921316000302