Time variability of solar active regions at centimeter wavelengths

Details Time variability of solar active regions at centimeter wavelengths Time variability of solar active regions at centimeter wavelengths

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342..586s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 1, 1989, p. 586-593.

Astronomy and Astrophysics

Astrophysics

5

Brightness Temperature, Centimeter Waves, Solar Activity, Solar Atmosphere, Solar Radiation, Bremsstrahlung, Electron Density (Concentration), Optical Thickness, Solar Magnetic Field, Very Large Array (Vla)

Scientific paper

An analysis is presented of the variability of centimeter wavelength emission originating from the solar transition region and lower corona, and the variability is compared with the sun's quiescent emission. Sequential dual wavelength observations are presented and used to put constraints on a possible model of the variability of active region emissions and to better understand the dynamics of active regions. It is shown that gyroresonance emission contributes significantly to the active region emission at 6 cm, whereas all the quiet-sun emission can be attributed to free-free emission. From comparison of the quiet-sun and active region models, it is shown that the density at the base of the transition region is higher in active regions.

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