Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...167..166k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 167, no. 1, Oct. 1986, p. 166-172.
Astronomy and Astrophysics
Astrophysics
15
Brightness Temperature, H Alpha Line, Millimeter Waves, Solar Prominences, Solar Radio Emission, Spectroheliographs, Astronomical Maps, Microwaves, Solar Corona, Very Large Array (Vla)
Scientific paper
Using the Very Large Array the authors have 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 region of reduced intensity in the He 10830 Å around filaments, which correspond to coronal cavities. The authors have 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. They find that the observations can be better explained by a model having a pressure gradient in the transition sheath around the filament.
Kundu Mukul R.
Melozzi Mauro
Shevgaonkar R. K.
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