Observation of a solar flare at the limb with the YOHKOH Soft X-ray Telescope

Details Observation of a solar flare at the limb with the YOHKOH Soft X-ray Telescope Observation of a solar flare at the limb with the YOHKOH Soft X-ray Telescope

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44l..63t&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 5, p. L63-L69.

Astronomy and Astrophysics

Astronomy

254

Solar Flares, Solar Limb, Spaceborne Telescopes, X Ray Telescopes, Japanese Spacecraft, Magnetic Field Reconnection, Solar Corona

Scientific paper

A long-enduring soft X-ray flare at the solar limb was well observed by the Soft X-ray Telescope aboard the Yohkoh spacecraft from the preflare stage through the postflare phase. A 'helmet streamer' arch appears several hours prior to the flare, in association with a continuous expansion and restructuring of the active-region magnetic structure. This arch then starts to flare, and increases its height and footpoint separation at v = 10-30 km/s. The arch has a complex temperature structure in the rising phase, whereas the outer arches have systematically higher temperatures in the decay phase. Magnetic reconnection in a neutral sheet at the loop top, created by preflare magnetic restructuring, would explain this type of flare.

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