Submillimeter observations of solar active regions

Details Submillimeter observations of solar active regions Submillimeter observations of solar active regions

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217..999r&link_type=abstract

Astrophysical Journal, Part 1, vol. 217, Nov. 1, 1977, p. 999-1005.

Astronomy and Astrophysics

Astrophysics

5

Atmospheric Windows, Brightness Temperature, Solar Activity, Solar Atmosphere, Solar Radio Emission, Submillimeter Waves, Atmospheric Heating, Microwave Emission, Optical Thickness, Photosphere, Solar Magnetic Field

Scientific paper

Observations of solar active regions in the several atmospheric windows between 350 microns and 1 mm have been obtained. All the active regions studied appear as regions of enhanced brightness temperature at all submillimeter wavelengths of observation. There is close spatial coincidence of the brightness-temperature enhancements with the regions of most intense photospheric magnetic field. Spectra suggest that the observed temperature increase at submillimeter wavelengths is caused by a general heating of the solar atmosphere at levels where the optical depth at 5000 A is less than 0.0001.

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