May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..127..149s&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 127, May 1990, p. 149-163. Research supported by SRON, SERC, and Ministry for Education and
Physics
24
Coronal Loops, Solar Magnetic Field, Solar Prominences, Solar X-Rays, Chromosphere, H Alpha Line, Magnetic Field Configurations, Surges, X Ray Imagery
Scientific paper
Evidence of X-ray emission from surges that are bright in H-alpha is reported. These surges have many features common to the flaring arches of Martin and Svestka (1988); the basic difference between the two is that in flaring arches cold and hot plasma are injected into clearly defined closed magnetic loops, while in the surges the injection goes into large-scale magnetic-field structures of which the second footpoint is usually unknown. Because of the steep density gradient in such large-scale structures, the X-ray visibility of bright surges is limited to a few tens of seconds only. A series of repetitive surges, some of them bright and emitting X-rays, occurred on July 8, 1980 from footpoints of two large-scale coronal structures, which might have been the legs of an enormous arch at least 600 Mm long.
Farnik Frantisek
Svestka Zdenek
Tang Frances
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