Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...298..911w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 298, Nov. 15, 1985, p. 911-917.
Astronomy and Astrophysics
Astrophysics
18
Cyclotron Radiation, Periodic Variations, Solar Activity, Solar Radio Emission, Stellar Magnetic Fields, Bremsstrahlung, Interferometry
Scientific paper
VLA observations of a solar active region at 10 closely spaced frequencies between 1440 and 1720 MHz are presented. The synthesis maps show, on two successive days, significant changes in the brightness temperature within this narrow frequency range. It is shown that these changes cannot be due to either thermal bremsstrahlung or gyroresonance emission from a coronal loop in which the temperature, density, or magnetic field varies monotonically with height. Instead, the brightness spectrum is attributed to cylotron line emission from a narrow layer where the temperature is elevated above the surrounding part of the loop.
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