Diagnostics of Non-Thermal Distribution from RESIK and RHESSI Flare Spectra

0386736 - ASÚ 2013 RIV US eng C - Conference Paper (international conference)
Kulinová, Alena - Kašparová, Jana - Dzifčáková, Elena - Sylwester, J. - Sylwester, B.
Diagnostics of Non-Thermal Distribution from RESIK and RHESSI Flare Spectra.
Hinode-3: The 3rd Hinode Science Meeting. San Francisco: Astronomical Society otf the Pacific, 2012 - (Sekii, T.), s. 329-332. ASP Conference Series, 454. ISBN 9781583817902.
[Hinode Science Meetin /3./. Tokyo (JP), 01.12.2009-04.12.2009]
R&D Projects: GA ČR GA205/09/1705
Grant - others:SAV(SK) Vega 1/0069/08
Institutional research plan: CEZ:AV0Z10030501
Keywords : solar flare spectra * non thermal distribution * diagnostics
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

Solar flare spectra observed by the X-ray spectrometers RESIK and RHESSI with high energy resolution enabled us to analyse possible non-thermality of plasma electron distribution in the keV range. For RESIK diagnostics (in the 2-4 keV range) we assumed that the bulk of the plasma is represented by the so-called n-distribution, which describes the deviations from the Maxwellian distribution by two parameters: n and T. Using thick-target approximation for RHESSI spectral analysis, we obtained characteristics of injected electron power-law distribution in the deka-keV range. The event presented here shows a very good time correlation of non-thermality obtained from the RESIK spectra with appearance of non-thermal component in RHESSI and/or radio spectra. However, a thermal component was still present in RHESSI. Both spectral and imaging information in RHESSI soft and hard X-ray ranges were used for the estimation of the ratio of thermal to non-thermal electron densities of the X-ray emitting plasma.
Permanent Link: http://hdl.handle.net/11104/0217823