VLA observations of a radio plage at centimeter wavelengths

Details VLA observations of a radio plage at centimeter wavelengths VLA observations of a radio plage at centimeter wavelengths

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph...98..119s&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 98, July 1985, p. 119-126.

Physics

10

Centimeter Waves, Faculae, Solar Activity, Solar Radio Emission, Astronomical Maps, Bremsstrahlung, Electron Density (Concentration), Emission Spectra, H Alpha Line

Scientific paper

VLA observations of a solar plage region at 6 and 20 cm wavelengths are presented. The high frequency 6 cm emission correlates well with the associated sunspots, whereas 20 cm emission shows good correlation with the Hα plage. Large temperature variations over a period of one day are observed in the plage associated component without any significant changes in the sunspots. The dominant emission mechanisms at 6 and 20 cm are found to be gyroresonance radiation and bremsstrahlung respectively. It is concluded that the coronal condensation above the chromospheric Hα plage has an electron density of ≡5×109cm-3 and it extends to a height of ≡5×104km.

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