Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.4411z&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #44.11; Bulletin of the American Astronomical Society, Vol. 26, p.1378
Astronomy and Astrophysics
Astronomy
Scientific paper
Solar filaments form in filament channels, which are narrow regions of aligned H alpha fibrils along a magnetic neutral line.The growth of a filament into a pre-existing channel, and the filling of the filament with cool plasma,is the subject of this paper. A quiescent filament was observed July 4-10,1994 at the Vacuum Tower Telescope at Sunspot,N.M. Grids of H alpha spectra and simultaneous H alpha images were recorded and analyzed. On the day of best seeing (July 9) the Doppler velocities at footpoints at the growing end were all positive( red-shifted) while those at the opposite stable end were all negative(blue-shifted).Siphon flow at speeds of a few km/s are indicated.But on July 6 a long fibril at the growing end of the filament had a pattern of Doppler velocities consistent with draining motions.Evidently the growth of filament fine-structure is sporadic.
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