High-temperature plasmas in active regions observed with the Soft X-ray Telescope aboard YOHKOH

Details High-temperature plasmas in active regions observed with the Soft X-ray Telescope aboard YOHKOH High-temperature plasmas in active regions observed with the Soft X-ray Telescope aboard YOHKOH

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44l.135h&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 5, p. L135-L140.

Astronomy and Astrophysics

Astronomy

128

High Temperature Plasmas, Image Filters, Solar Activity, Solar X-Rays, Spaceborne Astronomy, X Ray Telescopes, Japanese Spacecraft, Spaceborne Telescopes

Scientific paper

High-temperature plasmas reaching 5-6 x 10 exp 6 K in solar active regions have been found with the Soft X-ray Telescope aboard Yohkoh. NOAA region 6919 was investigated in detail using five different X-ray filters. The temperature of a bright loop in the active region is 5.7 x 10 exp 6 K, with an emission measure of 5.0 x 10 exp 28/cm exp 5; in a fainter part of the region plasma, we find 5.0 x 10 exp 6 K and 4.0 x 10 exp 27/cm exp 5. This indicates that such high-temperature plasmas exist in the active region, irrespective of the brightness. Another observation of the quiet corona was conducted in order to investigate the reliability of a temperature analysis with the same filter pairs which show such high temperatures in active regions. The inferred temperature was 2.7 x 10 exp 6 K, and the emission measure 1.3 x 10 exp 26/cm exp 5 which is consistent with the typical results of Skylab. Therefore, the high-temperature plasmas in solar active regions are considered to be real.

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