Enhanced X-ray emission above 3.5 keV in active regions in the absence of flares

Details Enhanced X-ray emission above 3.5 keV in active regions in the absence of flares Enhanced X-ray emission above 3.5 keV in active regions in the absence of flares

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...89..287s&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 89, Dec. 1983, p. 287-305.

Astronomy and Astrophysics

Astronomy

51

High Temperature Plasmas, Solar Corona, Solar X-Rays, X Ray Astronomy, Satellite-Borne Instruments, Solar Flares, Solar Maximum Mission, Spectrometers, Statistical Analysis, X Ray Sources

Scientific paper

It is demonstrated that, even in the absence of flares, there are very often volumes of hot plasma in the corona above active regions with temperatures in excess of 10 million degrees. Characteristics of this hot plasma and its time variations seem to be different in active regions of different phase of development. These hot plasma regions are sources of very weak, but clearly recognizable, X-ray emission above 3.5 keV. Long-lived X-ray brightenings, 10,000 times weaker than a flare but lasting up to 10 hr, occur predominantly along the H (parallel) = 0 line, apparently low in the corona. After major flares, long lived X-ray emission is also radiated from tops of arches extending high into the corona. Some other long-lived sources, far from the H (parallel) = 0 line, may be associated with newly emerging flux. Short lived X-ray sources, with fluxes ranging from subflare levels to 0.001 times the flare flux, last for 2 to more than 30 min, and are probably microflares. They seem to be most frequent in growing young active regions, and appear often in areas with newly emerging flux.

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