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Hard X-ray Radiation from Solar Flares in the Second Half of 2001: Preliminary Results of the SPR-N Experiment Onboard the Coronas-F Satellite |
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| Authors: | Bogomolov A. V. Denisov Yu. I. Kuznetsov S. N. Lisin D. V. Logachev Yu. I. Morozov O. V. Myagkova I. N. Svertilov S. I. Zhitnik I. A. Ignat'ev A. P. Oparin S. N. Pertsov A. A. Stepanov A. I. Tindo I. P. |
| Affiliation: | (1) Skobeltsyn Institute of Nuclear Physics, Moscow State University, Vorob'evy gory, Moscow, 119992, Russia;(2) Lebedev Physical Institute, Russian Academy of Sciences, Leninskii pr. 53, Moscow, 119991, Russia;(3) Institute of Terrestrial Magnetism, Ionosphere, and Radiowave Propagation, Russian Academy of Sciences, Troitsk, 142092, Russia |
| Abstract: | The first results of the experiment with the SPR-N hard X-ray (20–100 keV) polarimeter onboard the Coronas-F observatory (the experiment started on August 15, 2001) are presented. Hard X-ray radiation was detected from several solar flares. The spectral and temporal parameters were determined and the polarization was estimated. Comparison with the GOES observations of thermal X-ray radiation shows that hard X-ray bursts occur at the growth phase of the thermal radiation and that they are associated with the bremsstrahlung of energetic electrons precipitating into the solar atmosphere. |
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