Microwave and hard X-ray sources in two X-class limb flares

Details Microwave and hard X-ray sources in two X-class limb flares Microwave and hard X-ray sources in two X-class limb flares

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..374..393n&link_type=abstract

High energy solar physics. AIP Conference Proceedings, Volume 374, pp. 393-401 (1996).

Physics

Solar Electromagnetic Emission

Scientific paper

We have analyzed two intense, extended microwave and hard X-ray flares which occurred slightly behind the west limb and were accompanied by X-class, long-duration events (LDEs) in soft X-rays. We have found that: (1) Both events have typical soft X-ray properties of LDEs. (2) A major hard X-ray source at 23-33 keV and 33-53 keV is located in the high-temperature region, considerably higher than the corresponding soft X-ray loop, while a 17 GHz microwave source, where electrons at energy >= several hundreds keV mainly contribute to the 17 GHz emission, nearly coincides with the soft X-ray loop in extent. (3) The electron spectrum, which is derived from the microwave spectrum, is significantly harder than the electron spectrum at energy <=100 keV, which is derived from the hard X-ray data. (4) The time profile of total intensity at 17 GHz is delayed by about 25 s with respect to that of the hard X-rays for one of the events. The above results show evidence that lower-energy (<=100 keV) electrons with a softer spectrum are accelerated at the top of the cusp, and that higher-energy (>>100 keV) electrons are accelerated at the top of the soft X-ray loop and trapped. Probably, the lower-energy electrons accelerated in the cusp are transferred by a reconnection outflow into the second acceleration region at the top of the soft X-ray loop, and further accelerated to higher energy.

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