Astronomy and Astrophysics – Astronomy
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pazh...14..461z&link_type=abstract
Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 14, May 1988, p. 461-472. In Russian.
Astronomy and Astrophysics
Astronomy
6
Cyclotron Radiation, Microwave Spectra, Solar Radio Emission, Line Spectra, Solar Activity, Solar Magnetic Field
Scientific paper
An interpretation of VLA observations of Willson (1985) who detected a cyclotron line in the spectrum of microwave radiation from the solar active regions is proposed. The existence of cyclotron lines was predicted by the authors in 1980 on the basis of an active region model in which thermal cyclotron radiation is produced by hot plasma filling the magnetic tube in the corona above a group of spots. In this model the frequency of 1658 MHz line recorded by Willson corresponds to the third harmonic of electron gyrofrequency, which yields the magnetic field (196±4) G along the magnetic tube axis. Analysis shows that the study of cyclotron lines can serve as an efficient tool for diagnostics of magnetic fields and plasma in the active regions of the solar corona.
Zhelezniakov Vladimir V.
Zlotnik Ia. E.
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