High-resolution VLA maps of the quiescent corona at 90 CM wavelength

Details High-resolution VLA maps of the quiescent corona at 90 CM wavelength High-resolution VLA maps of the quiescent corona at 90 CM wavelength

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...199..325l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 199, no. 1-2, June 1988, p. 325-328.

Astronomy and Astrophysics

Astrophysics

5

Coronagraphs, Solar Radio Emission, Very Large Array (Vla), Astronomical Maps, Centimeter Waves, Coronal Holes, Coronal Loops, Noise Storms, Solar Activity

Scientific paper

The authors present the first Very Large Array (VLA) synthesis maps of the quiescent corona at 90 cm wavelength and compare them with optical solar features. The quiescent corona at 90 cm wavelength is very inhomogeneous and variable, with the most intense emission concentrated within structures near the equatorial regions. This emission may be the thermal bremsstrahlung of a coronal plasma that might be confined in large-scale magnetic structures. The 90 cm sources are not systematically associated with any optical counterpart including active regions, filaments, sunspots and the magnetic neutral line, at least for the observations presented here. There is no intense 90 cm radiation in the polar regions, and this is at least partly due to coronal holes. More compact 90 cm sources in the quiescent corona also show no systematic correlation with optical counterparts. Associations with the magnetic neutral line are uncertain.

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