Variability of metric emission from the sun

Details Variability of metric emission from the sun Variability of metric emission from the sun

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329..982s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 329, June 15, 1988, p. 982-990.

Astronomy and Astrophysics

Astronomy

10

Brightness Temperature, H Alpha Line, Solar Prominences, Solar Radio Emission, Solar Spectra, Plasma Radiation, Radio Astronomy, Thermal Emission, Very Large Array (Vla)

Scientific paper

Full-disk observations of the sun obtained with the VLA at 317 MHz have been analyzed, with special attention being given to the short period variability of the meter-wavelength sources. A reduction in brightness is noted over coronal holes at 90 cm. Thermal emission models for the slowly varying component are investigated, along with a nonthermal emission mechanism for storm radiation at meter wavelengths. The results indicate that the thermal model encounters difficulties in accommodating short period changes over a few tens of minutes, and that the nonthermal mechanism encounters difficulty in accounting for the variability of low brightness temperatures of less than 10 to the 6th K. A gyrotron synchrotron emission mechanism has been ruled out.

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