Ubiquitous chromospheric structures observed in the quiet sun at millimeter and centimeter wavelengths

Details Ubiquitous chromospheric structures observed in the quiet sun at millimeter and centimeter wavelengths Ubiquitous chromospheric structures observed in the quiet sun at millimeter and centimeter wavelengths

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...58..337l&link_type=abstract

Solar Physics, vol. 58, July 1978, p. 337-342.

Physics

Centimeter Waves, Chromosphere, Microwave Emission, Millimeter Waves, Solar Atmosphere, Angular Resolution, Interferometers, Radiant Flux Density, Temperature Effects, Thermal Radiation

Scientific paper

Unique long-term visibility variations are detected when the quiet sun is observed with interferometers operating at 8 mm and 11 cm wavelength with angular resolutions of approximately 0.5 arcmin. Quasi-periodic fluctuations in fringe amplitude are observed with periods between 20 and 30 min, and with amplitude nulls which are correlated with 180 deg phase changes. These variations are interpreted in terms of a changing projected baseline while viewing a few sources with angular sizes of approximately 0.5 arcmin which are distributed within the main interferometer beam with typical angular separations of 7 arcmin. A comparison of the flux observed at 8 mm and 11 cm indicates that the individual sources are optically thick thermal radiators with a flux which decreases with increasing wavelength, but with a temperature which increases with increasing wavelength where higher, hotter levels of the chromosphere are observed. For a source whose angular size is 0.5 arcmin, the observed flux values correspond to respective temperatures of 5000 K and 19,000 K at 8 mm and 11 cm.

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