VLA observations of compact, variable sources on the sun

Details VLA observations of compact, variable sources on the sun VLA observations of compact, variable sources on the sun

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...308..443w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 308, Sept. 1, 1986, p. 443-447.

Astronomy and Astrophysics

Astrophysics

11

Solar Activity, Solar Magnetic Field, Solar Radio Emission, Circular Polarization, Interferometry, Relativistic Electron Beams, Synchrotron Radiation

Scientific paper

Observations of solar active region AR 4508, obtained at 2.1 and 20.7 cm using the C configuration of the VLA on June 4, 1984, are reported. Compact (5-arcsec) sources with brightness temperature 50,000-300,000 K and circular polarization 80-90 percent are detected at 2.1 cm in regions with magnetic fields 80 G or less and found to vary on times scales of 10-20 s and 30-60 min. The emission of the sources is attributed to power-law-spectrum gyrosynchrotron radiation from mildly relativistic electrons, and its variability is related to variations in either the magnetic field or the nonthermal-electron density.

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