A study of filament transition sheath from radio observations

Details A study of filament transition sheath from radio observations A study of filament transition sheath from radio observations

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...55..161r&link_type=abstract

Solar Physics, vol. 55, Nov. 1977, p. 161-175.

Astronomy and Astrophysics

Astronomy

16

H Alpha Line, Radio Spectra, Solar Corona, Solar Spectra, Astronomical Maps, Optical Thickness, Stellar Models, Ultraviolet Astronomy

Scientific paper

An H-alpha dark filament has been observed at 8, 15 and 22 GHz, and its radio spectrum derived. It is suggested that the filament may be optically thick at radio frequencies and that the observed spectrum may be due to the presence of a transition sheath surrounding the filament. A model is developed for the transition sheath in which the energy radiated away is balanced by the conduction of heat from the corona; the radio observations indicate that little or no thermal energy is conducted into the main body of the filament. The model is compared with ultraviolet observations of filaments.

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