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VLA observations of a solar active region and coronal loops (1983)

Kundu, M. R. ; Mcconnell, D.

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Publication Date: 2019-06-28

Description: In May 1981, observations of a solar active region at 6 cm and 20 cm were conducted with the aid of a Very Large Array (VLA). It was found that the 6 cm emission was associated with sunspots and transverse magnetic fields between spots. The 20 cm emission came from elongated sources connecting regions of opposite magnetic polarity. The sources of the emission at 20 cm could be identified as coronal loops. A model for hydrostatic loops proposed by Rosner et al. (1978) was employed to determine a likely mechanism for the emission at 20 cm. It was found that a two-component model of bremsstrahlung emission from the feet and gyroresonance emission from the top of the loops can satisfactorily explain the observations.

Keywords: SOLAR PHYSICS

Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 269; June 15

Format: text

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