The structure of the microwave emission from sunspot magnetic fields

Details The structure of the microwave emission from sunspot magnetic fields The structure of the microwave emission from sunspot magnetic fields

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342.1172b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 15, 1989, p. 1172-1186.

Astronomy and Astrophysics

Astrophysics

19

Microwave Emission, Polarization (Waves), Solar Magnetic Field, Sunspots, Approximation, Brightness Temperature, Gyrofrequency, Very Large Array (Vla)

Scientific paper

Theoretical microwave intensity and polarization maps have been obtained for a sunspot model which incorporates a point dipole buried below the photosphere, a 2000-km thick transition region separating the chromosphere from the corona, a coronal temperature of 2.5 x 10 to the 6th K, and a coronal density of about 10 to the 9th/cu cm. The present code includes both thermal bremsstrahlung and thermal gyroemission at the 1st-5th harmonics of the local electron gyrofrequency. The maps are shown to accurately reproduce many of the observed sunspot features. Significant changes in the I and V maps are found over closely spaced frequencies in the 5-GHz band which would be detectable with the VLA.

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