Structure of a solar active region from RATAN 600 and very large array observations

Details Structure of a solar active region from RATAN 600 and very large array observations Structure of a solar active region from RATAN 600 and very large array observations

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301..460a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 301, Feb. 1, 1986, p. 460-464.

Astronomy and Astrophysics

Astrophysics

44

Centimeter Waves, Solar Activity, Solar Magnetic Field, Solar Radio Emission, Very Large Array (Vla), Bremsstrahlung, Magnetic Flux, Radio Telescopes, Solar Flux Density, Solar Temperature, Sunspots

Scientific paper

Solar active region AR 3804 was observed simultaneously with the RATAN 600 and the VLA in 1982 July. The emission at wavelengths between 2 and 4 cm consisted of narrow (φ < 40arcsec), bright (TB ≈ 0.2 to 6×106K) core sources surrounded by a weaker (TB ≈ 104 - 105K), extended (φ ≈ 200arcsec) halo. The brightest core sources are associated with sunspots and are interpreted in terms of the gyroradiation of thermal electrons at the second and third harmonics of the gyrofrequency. Two of the core sources were associated with a filament that lies above the magnetic neutral line in the photosphere. Magnetic field strengths are derived for these sources.

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