Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9131059w&link_type=abstract
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Astronomy and Astrophysics
Astronomy
Astronomical Catalogs, H Alpha Line, Magnetic Storms, Solar Prominences, Solar Storms, Chromosphere, Magnetic Fields, Photosphere
Scientific paper
Solar filaments are readily detected in H(alpha) observations of the Sun as either extended, dark features seen above the disk, or as bright prominences seen above the limb. They vary enormously in size. Filaments always lie above magnetic inversion lines, which separate regions of opposite magnetic polarity in the photosphere, although not all inversion lines are marked by visible filaments. Therefore, they enable the broad features of the large-scale magnetic fields at photospheric and chromospheric levels to be mapped from routine H(alpha) photographs. The primary motivation for compiling the catalogue was to examine the relationship between filament disappearances, interplanetary disturbances, and geomagnetic storms. Initially, the need was for a large, internally consistent list of events, and completeness was of secondary importance. The first tabulation fullfilled the purpose, but it was incomplete and did not provide a very satisfactory description of the filaments. The present catalogue is more complete, extends over a greater time-span and contains more information about each event. It is important to emphasize at this point that the filament disappearances tabulated in the catalogue are, in general, not associated with active regions or with flares within active regions. They predominantly lay over the quiet chromosphere and were generally much larger than active region filaments. Therefore, they should not be confused with the small, dark, inversion-line filaments which frequently erupt as part of the flare process within active regions.
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