Astronomy and Astrophysics – Astronomy
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976rspta.281..365v&link_type=abstract
(Royal Society, Discussion on the Physics of the Solar Atmosphere, London, England, Jan. 14, 15, 1975.) Royal Society (London),
Astronomy and Astrophysics
Astronomy
21
Skylab Program, Solar Corona, Solar X-Rays, X Ray Telescopes, Solar Flares, Solar Rotation, Spaceborne Astronomy
Scientific paper
Recent results obtained with the X-ray telescope aboard Skylab are reviewed, and an overall view of the low corona as seen in X-rays is presented with emphasis on the role of active regions. Observed features discussed include coronal holes, large-scale loops, bright points, active regions, and C-flares. Values of typical parameters are tabulated for each type of feature, general aspects of the structure and evolution of active regions are described in detail, and the dynamics of active region development is examined. Some results which emerge from analyses of the data are: (1) the low corona is highly structured with the plasma distributed in closed loops shaped by the magnetic field, (2) the large-scale loops appear to be related to old active regions whose magnetic fields have spread out over the course of several solar rotations, (3) bright points behave like miniature active regions, but their production mechanism is different from that for active regions, and (4) a continuous input of energy into the corona is required since the cooling times of the coronal structures are less than their characteristic lifetimes in every case with the possible exception of flares.
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