Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44l..83s&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 5, p. L83-L87.
Astronomy and Astrophysics
Astronomy
63
Solar Flares, Solar X-Rays, Spaceborne Astronomy, X Ray Telescopes, Japanese Spacecraft, Line Spectra, Solar Magnetic Field
Scientific paper
We report on hard X-ray imaging observations of the 1991 November 15 flare with the HXT instrument aboard Yohkoh. Distributions of the hard X-ray sources at various stages of the flare, together with an overlay of the white-light flare, are presented. Attention is concentrated on the behavior of hard X-ray sources during the impulsive phase. The hard X-ray source appeared initially as a single source near the magnetic neutral line, then evolved into a double-source shape with the separation increasing with time. We believe that this is evidence for a multiple loop system flaring successively with a rising energy-release site. At the minima between the individual spikes of the time profile, the hard X-rays at 20-30 keV were concentrated near the apex of the flaring loop, whereas the hard X-rays above 30 keV originated from the footpoints. These observations are compared with the existing models.
Acton Loren W.
Canfield Richard C.
Hudson Hugh S.
Inda Mika
Kosugi Takeo
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