Spatial development of X-ray emission during the impulsive phase of a solar flare |
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| Authors: | Cornelis De Jager André Boelee David M Rust |
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| Institution: | (1) Laboratory for Space Research, Utrecht, The Netherlands;(2) American Science and Engineering Inc., Cambridge, Mass., U.S.A.;(3) Present address: Space Department, John Hopkins Applied Physics Laboratory, John Hopkins Road, Laurel, Md., U.S.A. |
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| Abstract: | 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 172320 UT with a slight enhancement of hard X-rays (E > 30 keV) accompanied by the formation of a dark loop between two H bright ribbons. In 3–8 keV X-rays a southward expansion started at the same time, with   - 500 km s –1. At the same time a surge-like expansion started. It was observable slightly later in H, with southward velocities of  200 km s–1. The dark H loop dissolved at 1724 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 172540 UT, a coronal explosion occurred directed southward with an initial expansion velocity of 1800 km s–1, decreasing in 40 s to 500 km s–1.Now at Fokker Aircraft Industries, Schiphol, The Netherlands. |
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