Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...279..421m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 279, April 1, 1984, p. 421-426.
Astronomy and Astrophysics
Astronomy
7
Centimeter Waves, Fine Structure, Radio Astronomy, Solar Radiation, Sunspots, Circular Polarization, Gyrofrequency, Optical Thickness, Radio Interferometers, Radio Spectra, Solar Corona, Solar Magnetic Field, Spectral Energy Distribution, Visible Spectrum
Scientific paper
A complex solar active region at 6 cm has been observed with the VLA. Radio images of the region have been constructed and compared with simultaneous optical data from the region. It is found that all radio sources are associated with either sunspots or regions of the corona where strong transverse magnetic fields are likely, that the transverse field sources are brighter than the sunspot sources, and that some of the sunspot sources have a polarized ring structure. The observations are interpreted in terms of thermal gyroresonance emission, with the radiation from the transverse field sources being at the third harmonic of the gyrofrequency and predominantly at the second harmonic from the sunspot sources.
Kundu Mukul R.
McConnell David
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