Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...55..181w&link_type=abstract
Solar Physics, vol. 55, Nov. 1977, p. 181-193. Research supported by the Lockheed Independent Research Program;
Astronomy and Astrophysics
Astronomy
11
Magnetic Field Reconnection, Solar Activity, Solar Physics, Solar X-Rays, Oso-8, Plasma Radiation, Solar Flares, Spaceborne Astronomy
Scientific paper
The birth and early evolution of a solar active region has been investigated using X-ray observations from the mapping X-ray heliometer on board the OSO-8 spacecraft. X-ray emission is observed within three hours of the first detection of H-alpha plage. At that time, a plasma temperature of four million K in a region having a density on the order of 10 to the 10th power per cu cm is inferred. During the fifty hours following birth almost continuous flares or flare-like X-ray bursts are superimposed on a monotonically increasing base level of X-ray emission produced by the plasma. If the X-rays are assumed to result from heating due to dissipation of current systems or magnetic field reconnection, it may be concluded that flare-like X-ray emission soon after active region birth implies that the magnetic field probably emerges in a stressed or complex configuration.
Acton Loren W.
Leibacher John W.
Roethig Douglas T.
Wolfson Jacob C.
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