Compact, variable sources on the Sun at 2 centimeter wavelength

Details Compact, variable sources on the Sun at 2 centimeter wavelength Compact, variable sources on the Sun at 2 centimeter wavelength

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988soph..114...93w&link_type=abstract

Solar Physics, Volume 114, Issue 1, pp.93-104

Physics

Scientific paper

Very Large Array (VLA) observations of compact transient sources on the Sun at 2 cm wavelength are presented. These sources have angular sizes of θ ≈ 5″ 25″, brightness temperatures of T B≈ 1 3 × 105 K, and lifetimes ranging between a few minutes to several hours. The emission originates in regions of diffuse plage and quiet Sun, where the photospheric magnetic fields are relatively weak (H ≤ 100 G). In some cases the 2 cm radiation may be explained as the thermal bremsstrahlung of a dense (N e≤ 1010 cm-3) plasma in the transition region. For other sources, the relatively high circular polarization (ϱ c≈ 40 50 %) suggests a nonthermal emission mechanism, such as the gyrosynchrotron radiation of mildly relativistic electron with a power-law spectrum.

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