Solar flare iron K-alpha emission associated with a hard X-ray burst
Abstract
High-resolution observations of the solar flare event of 20:09:30 UT on July 28, 1981, obtained with the Bragg crystal spectrometers (line spectra of soft X-rays at 175-195 pm) and the soft-X-ray and hard-X-ray spectrometers (continuum spectra at 1.5-12.5 and 18-400 keV, respectively) of the Japanese solar-maximum satellite Hinotori are reported. The data are presented in graphs, sample spectra, and tables and analyzed. An intense K-alpha Fe emission is found to be associated with a hard X-ray burst with a power-law photon distribution from below 10 to above 100 keV during the first part of the flare. The K-alpha emission during the X-ray burst and after its decay are attributed to photospheric neutral-Fe fluorescence induced by the burst X-rays and thermal X-rays, respectively.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- July 1984
- DOI:
- 10.1086/162264
- Bibcode:
- 1984ApJ...282..793T
- Keywords:
-
- K Lines;
- Solar Flares;
- Solar X-Rays;
- Bursts;
- Monte Carlo Method;
- Proportional Counters;
- Scintillation Counters;
- Solar Spectra;
- Spectrometers;
- Solar Physics