Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasj...51..483h&link_type=abstract
Publications of the Astronomical Society of Japan, v.51, p.483-496.
Astronomy and Astrophysics
Astronomy
28
Sun: Emerging Flux, Sun: Flares, Sun: High-Energy Electrons, Sun: Radio Radiation, Sun: X-Rays
Scientific paper
We studied the fast temporal variations in the brightness of the radio and hard X-ray sources of three double-loop flares. In such flares, the main radio/hard X-ray source is located near to one of the footpoints of a large overlying loop, where a small, newly emerging loop appears and the two loops interact, and the remote source is located at another footpoint of the large loop. The following results were obtained from the analysis: (1) The main source and the remote source basically show a correlated brightness fluctuation, but the rapid fluctuation of the brightness of the remote source lags behind that of the main source for about 500 ms. This result is evidence that the electron-acceleration region is close to the main source and, therefore, it is most presumable that the high-energy electrons in the double-loop flares are accelerated in the interaction region of the two loops. (2) The brightness of the hard X-rays from the main source and that of the microwaves from the remote source fluctuate highly, but the microwaves from the main source fluctuate less. This result means that the microwave-emitting electrons are effectively trapped at the main source region.
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