Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986nascp2442..117k&link_type=abstract
In NASA. Goddard Space Flight Center Coronal and Prominence Plasmas p 117-120 (SEE N87-20871 13-92)
Astronomy and Astrophysics
Astronomy
4
Brightness Temperature, Radio Astronomy, Solar Corona, Solar Prominences, Solar Temperature, Spectroheliographs, Sun, Mapping, Solar Physics, Temperature Gradients, Very Large Array (Vla), Wavelengths
Scientific paper
Using the Very Large Array the author observed several solar filaments at 1.5 and 5 GHz. The brightness temperatures of the filaments are 4 - 5×104K at 20 cm and 1.5 - 1.6×104K at 6 cm. The maximum temperature depressions appear to be associated with Hα filaments. Comparison with He 10830 Å spectroheliogram shows that 20 cm temperature depressions correspond to the regions of reduced intensity in the He 10830 Å around filaments, which correspond to coronal cavities. The author studied the temperature and density structure of the transition sheath between the filament and the surrounding corona assuming that the energy radiated away is balanced by the energy conducted from the corona. He found that the observations can be better explained by a model having a pressure gradient in the transition sheath around the filament.
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