Production of a short-lived filament by a surge |
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Authors: | H Zirin |
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Institution: | (1) Big Bear Solar Observatory, Hale Observatories, Carnegie Institution of Washington, California Institute of Technology, U.S.A. |
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Abstract: | A large surge was observed on September 17, 1971, part of which, after travelling 200 000 km through the corona, returned to the surface to form a filament. The filament lasted about 30 min, then rose up and returned to the source of the surge. We interpret this as the filling of a semi-stable magnetic trap.The energetics of radio, X-ray, and surge expulsion are estimated. The radio spectrum and flux correspond to a thermal source of area 4 (arcmin)2, T 190 000 K, N
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V 7 × 1048, which is optically deep at 8800 MHz.The soft X-ray source has T 12 × 106 K, N
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V 3 × 1048; and if an equal mass is expelled in the surge, the kinetic energy of the surge is similar to the thermal energy of the X-ray source. |
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