Non-thermal Diagnostics of a Flare Observed by RESIK
Abstract
The Polish soft X-ray spectrometer RESIK operated on Russian Coronas-F spacecraft during the years 2001 - 2003. It has observed several flares of different classes in a wavelength band of 3.35, 6.05 Å. We have analysed two flares especially in a region of 5.0 - 6.05 Å which is dominated by allowed lines of Si XIII, Si XIV ions, and satellite lines of Si XII (Si XIId). The flare spectra showed unexpectedly high fluxes of Si XIId satellite lines as compared with fluxes of allowed lines of Si XIII ion which we attempted to explain under the assumption of a non-thermal electron distribution. We have investigated the temporal dependence of the deviation of the non-thermal distribution from the Maxwell distribution during a flare. The maximal deviation from thermal distribution correlates with times of observed radio bursts.
- Publication:
-
Central European Astrophysical Bulletin
- Pub Date:
- 2009
- Bibcode:
- 2009CEAB...33..243K
- Keywords:
-
- flare;
- soft X-rays;
- spectra;
- non-thermal distribution