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High-temperature solar flare plasma behaviour from crystal spectrometer observations

Published online by Cambridge University Press:  09 September 2016

Barbara Sylwester ,
Janusz Sylwester ,
Kenneth J.H. Phillips ,
Anna Kepa  and
Tomasz Mrozek
Barbara Sylwester
Affiliation:
Space Research Centre, Polish Academy of Sciences, Wrocław, Poland email: bs@cbk.pan.wroc.pl
Janusz Sylwester
Affiliation:
Space Research Centre, Polish Academy of Sciences, Wrocław, Poland email: bs@cbk.pan.wroc.pl
Kenneth J.H. Phillips
Affiliation:
Dept. of Earth Sciences, Natural History Museum, London SW7 5BD, U.K. email: kennethjhphillips@yahoo.com
Anna Kepa
Affiliation:
Space Research Centre, Polish Academy of Sciences, Wrocław, Poland email: bs@cbk.pan.wroc.pl
Tomasz Mrozek
Affiliation:
Space Research Centre, Polish Academy of Sciences, Wrocław, Poland email: bs@cbk.pan.wroc.pl Astronomical Institute of Wrocław University, Wrocław, Poland email: mrozek@astro.uni.wroc.pl
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Abstract

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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.

Keywords

Sun: abundancesSun: flaresSun: X-rays
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S320: Solar and Stellar Flares and their Effects on Planets , August 2015 , pp. 80 - 85
Copyright
Copyright © International Astronomical Union 2016 

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