Other
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...300..438d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 300, Jan. 1, 1986, p. 438-441, 443-447.
Other
30
Imaging Techniques, Microwave Emission, Solar Flares, Solar Radio Emission, Brightness Temperature, Field Strength, Solar Limb, Solar Magnetic Field, Time Response
Scientific paper
Using the VLA, the authors observed two impulsive microwave and hard X-ray flares that occurred close to the solar limb on 1981 November 21 and 22. Images were obtained simultaneously at 4.9 and 15 GHz every 10 s during the 5 minutes durations of the flares. The apparently simple impulsive flares were unexpectedly complicated when imaged with arcsecond resolution: the 4.9 and 15 GHz radiation came from spatially separated sources in one flare, and there was no 4.9 GHz radiation at all in the other. The authors interpret the observations in terms of an inhomogeneous flare volume with the magnetic field strength and orientation varying with position, both transverse to and along the line of sight. The 4.9 GHz radiation of the November 22 flare probably arose mainly from thermal electrons with temperatures between 5 and 20×106K. The 15 GHz radiation of the flares on both days probably arose from electrons of E ≈ 300 keV in a weak, nonthermal tail.
Bastian Tim S.
Dulk George A.
Kane Sharad R.
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