Compact sites of microwave emission at 2.8 centimeter wavelength inside solar active regions

Details Compact sites of microwave emission at 2.8 centimeter wavelength inside solar active regions Compact sites of microwave emission at 2.8 centimeter wavelength inside solar active regions

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...325..912g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 325, Feb. 15, 1988, p. 912-926.

Astronomy and Astrophysics

Astrophysics

8

Centimeter Waves, Microwave Emission, Solar Activity, Solar Magnetic Field, Solar Radio Emission, Chromosphere, Faculae, H Alpha Line, Magnetic Disturbances, S Waves, Sunspots

Scientific paper

The authors have located the positions of 59 hot, compact sources of 2.8 cm emission in 28 active regions with respect to photospheric and chromospheric structures. The same regions were photographed at high spatial resolution on the same days through a wavelength-scanning Hα filter. Almost 90% of these compact sources are associated with either a plage or a polarity reversal (or both together); they are found in just part of a plage (or polarity reversal) which may be one of several in the same active region. The authors propose that the observed properties of these compact sources can be explained in terms of emission from current-driven instabilities which are excited by evolutionary stresses acting on active regions.

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