Physics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...48..159w&link_type=abstract
Solar Physics, vol. 48, May 1976, p. 159-186.
Physics
74
Brightness Temperature, H Alpha Line, Skylab Program, Solar Corona, Solar X-Rays, Coronagraphs, Filaments, Solar Magnetic Field, Solar Temperature
Scientific paper
The X-ray telescope experiment aboard the Skylab/ATM mission provided high-resolution soft X-ray images of the lower corona away from active regions, revealing frequent large-scale transient X-ray enhancements which could often be associated with the disappearance of H-alpha filaments. The X-ray emitting structures featured peak brightnesses similar to those of nonflaring active region structures, durations from 3 to 40 hours, shapes that in general outlined the preexisting H-alpha filaments to as large as 400,000 km, apparent expansion velocities of the order of tens of km/sec, and observed peak temperatures of the order of a few million degrees. One such event is described and analyzed in detail. Two explanations of the events are discussed: (1) excess cool material is present in the filament cavity, contributing to the X-ray enhancement, and (2) the enhancement is due to the compression of preexisting material by a changing magnetic field.
Krieger Allen S.
Rust David Maurice
Webb David F.
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