Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...284..827t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 15, 1984, p. 827-832.
Astronomy and Astrophysics
Astronomy
35
High Temperature Plasmas, Japanese Spacecraft, Solar Flares, Solar X-Rays, X Ray Imagery, Photosphere, X Ray Astronomy
Scientific paper
Two solar hard X-ray bursts of a new type (hot thermal flare) were observed with hard X-ray imaging telescopes and other instruments on Japanese spacecraft Hinotori. The flares have no clear impulsive phase below 40 keV and emit intense hard X-rays (10-50 keV) with extremely steep spectra from a small region with size (FWHM) of 10-20 arcsec. This source contains a hot thermal plasma of (3-3.5) x 10 to the 7th K with an emission measure of the order of 10 to the 49th/cu cm. One of the flares occurred just on the limb, and the centroid of the hard X-ray (14-38 keV) source was located at (6 + or - 3) x 10 to the 3rd km above the photosphere. It is concluded that the energy continuously released goes into heating rather than acceleration almost throughout the flare. Typical impulsive flares may usually have a similar nature in the later phase (gradual phase) of the flare evolution.
Makishima Kazuo.
Murakami Tadayoshi
Nitta Nariaki
Oda Masuho
Ogawara Yoshiaki
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