Study of a filament with a circularly polarized beam at 3.8 CM

Details Study of a filament with a circularly polarized beam at 3.8 CM Study of a filament with a circularly polarized beam at 3.8 CM

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...45..131s&link_type=abstract

Solar Physics, vol. 45, Nov. 1975, p. 131-139.

Physics

16

Brightness Temperature, Circular Polarization, Solar Radio Emission, H Alpha Line, Solar Activity, Sunspots

Scientific paper

Extensive observations of left and right circularly polarized emission were carried out with a 120-ft antenna. During a very quiet period, two regions were observed in the southern hemisphere of the sun with brightness temperatures approximately 10% below the surrounding solar-disk temperature. H-alpha photographs show that the main region was associated with a long filament. The separation between the center of the radio depression and the filament increased as the filament advanced toward the limb, with the depression finally disappearing when the filament was at a radial distance of more than 0.8 solar radius from the center of the disk. These observations are in agreement with a filament model consisting of a thin tall exceedingly long sheet of enhanced density encaged in a large and equally long tunnel-like cavity of lower density. The electron density at the 3.8-cm emission level, which occurs immediately below the transition zone, was estimated to be lower inside the cavity than outside by a factor of 2. The origin of the other depression remains unclear because no relation to any H-alpha or magnetic feature could be found. A possible association with a coronal hole could not be established because no pertinent EUV or X-ray data were available.

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