Physics
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001soph..199..317t&link_type=abstract
Solar Physics, v. 199, Issue 2, p. 317-344 (2001).
Physics
4
Scientific paper
Daily surveys of the solar disc made at 2.8 cm wavelength over the period 1-13 November 1981, complemented by magnetograms and Hα filtergrams, are used to examine the relationship between sources of the slowly varying component of solar radio emission and properties of their host regions. Two classes of source are noted: diffuse and compact. Sources are designated compact when smaller than 40''. The diffuse sources may be explained in terms of free-free thermal emission from trapped plasma in loops overlying the active region. The great majority of compact sources can be accounted for in terms of gyroresonance from thermal electrons in the strong magnetic fields overlying sunspots. A small minority are less amenable to this explanation. They are associated with magnetic complexity and dynamism, lie close to magnetic polarity reversals, and could be non-thermal. Microwave sources are an evolutionary feature common to all but the smallest active regions.
Tapping K. F.
Zwaan Cornelis
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