Solar flare iron K-alpha emission associated with a hard X-ray burst

Astronomy and Astrophysics – Astrophysics

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K Lines, Solar Flares, Solar X-Rays, Bursts, Monte Carlo Method, Proportional Counters, Scintillation Counters, Solar Spectra, Spectrometers

Scientific paper

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.

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