Spatial development of X-ray emission during the impulsive phase of a solar flare

Details Spatial development of X-ray emission during the impulsive phase of a solar flare Spatial development of X-ray emission during the impulsive phase of a solar flare

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...92..245d&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 92, May 1984, p. 245-258. Research supported by the Ministry of Education and Science of Ne

Physics

16

Solar Flares, Solar X-Rays, Spatial Distribution, H Alpha Line, Light Curve, Magnetic Signatures, Radial Velocity, Solar Corona, Solar Magnetic Field

Scientific paper

The flare of 11 November, 1980, 17:25 UT occurred in a magnetically complex region. It was preceded by some ten minutes by a gradual flare originating over the magnetic inversion line, close to a small sunspot. This seems to have triggered the main flare (at 70,000 km distance) which originated between a large sunspot and the inversion line. The main flare started at 17:23:20 UT with a slight enhancement of hard X-rays (E greater than 30 keV) accompanied by the formation of a dark loop between two H-alpha bright ribbons. In 3-8 keV X-rays, a southward expansion started at the same time, with v of about 500 km/s. At the same time a surge-like expansion started. It was observable slightly later in H-alpha with southward velocities of about 200 km/s or greater. The dark H-alpha loop dissolved at 17:24 UT, at which time several impulsive phenomena started, such as a complex of hard X-ray bursts localized in a small area. At the end of the impulsive phase at 17:25:40 UT, a coronal explosion occurred directed southward with an initial expansion velocity of about 1800 km/s, decreasing in 40 s to about 500 km/s.

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