Physics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spro.proc...71b&link_type=abstract
Solar Physics with Radio Observations, Proceedings of the Nobeyama Symposium, held in Kiyosato, Japan, Oct. 27-30, 1998, Edited
Physics
Scientific paper
The data of multifrequency observations of AR 7962 on May 10--12, 1996 made in the range from 2 cm to 32 cm on reflective type radiotelescope RATAN-600 are given. The peculiarity of this sunspot-associated microwave source is a narrowband feature at the wavelength about 8.5 cm superimposed on typical frequency spectrum of the active region. Simultaneously, Nobeyama maps reveal a point-like bright source at the wavelength 1.7~cm, both sources coinciding. The observed line-like feature (the relative linewidth of which is about 0.2 and peak intensity exceeds the background radiation of sunspot-associated source by a factor of 2) can be interpreted as a cyclotron line. The life time of 3 days and brightness temperature not more than a few million Kelvin makes it possible to explain the observed line as thermal cyclotron radiation from compact source containing a hot dense plasma. High frequency radiation may be provided by bremsstrahlung from the same source. Analysis of the RATAN-600 and Nobeyama data permits one to measure magnetic field, kinetic temperature and electron density in the hot coronal loop.
Bogod Vladimir
Garaimov V.
Zheleznyakov Vladimir V.
Zlotnik E.
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