Abstract This paper draws attention to large-scale structures in the solar corona which have been observed only in soft X-rays. Some of them were seen on Skylab in 1973 with poor time resolution, some other aboard the SMM with poor spatial resolution. The Soft X-ray Telescope on SOLAR-A can see them with both kinds of resolution improved by an order of magnitude, provided that it images large enough field of view. Three kinds of structures are of particular interest: (a) Loops that interconnect active regions, even on opposite hemispheres. Observations of their birth may provide information both on the basic characteristics of solar activity and on solar atmospheric processes (reconnection). Their brightenings, losely related to flares, could contribute to our knowledge of instabilities in the solar corona. (b) Flaring arches inside active regions. They appear in extensive coronal structures which may exist for days and intermittently brighten in association with intense X-ray bursts. (c) Giant arches which appear for many hours high in the corona after dynamic flares. Their structure, mode of birth, and their relation to coronal mass ejections, is presently unknown.
Soft X-ray observations of large-scale coronal structures
Advances in Space Research ; 8 , 11 ; 81-86
01.01.1989
6 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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