Astronomy and Astrophysics – Astronomy
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001arep...45..409i&link_type=abstract
Astronomy Reports, Volume 45, Issue 5, May 2001, pp.409-414
Astronomy and Astrophysics
Astronomy
Scientific paper
The velocity field of the plasma in the solar photosphere beneath chromospheric Hα filaments is studied. Observations were conducted in 1999 2000 using the magnetograph and tachometer of the tower telescope of the Institute of Terrestrial Magnetism, Ionosphere, and Radio Propagation, recently upgraded to improve both its sensitivity and spatial resolution. The results confirm that, as noted earlier, filaments are frequently found near velocity-inversion lines between regions of upward and downward motion of solar material, and lie predominantly above regions with upward motion of photospheric material. This tendency is characteristic of both the stable filaments of active regions and quiescent filaments far from active regions, though it is more distinct for the former case. The upward motion of photospheric material beneath filaments may play an important role in supporting the filaments against gravity.
Ioshpa B. A.
Obridko Vladimir N.
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