An observational study of the 2B/X2.8 flare of 30 March, 1982 in optical,radio, and X-ray ranges |
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Authors: | J L Wang T Takakura J Q Liu K Ohki K Kawabata H Ogawa |
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Institution: | (1) Beijing Astronomical Observatory, Academia Sinica, Beijing, China;(2) Department of Astronomy, University of Tokyo, Bunkyo-ku, 113 Tokyo, Japan;(3) Tokyo Astronomical Observatory, University of Tokyo, Mitaka, 118 Tokyo, Japan;(4) Department of Physics and Astrophysics, Nagoya University, Chikusa-ku, 464 Nagoya, Japan |
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Abstract: | The 2B/X2.8 double-ribbon flare of 30 March, 1982 is investigated using H, white light, X-rays, and microwaves. The X-ray burst seems to consist of two components, i.e., an impulsive component showing a long chain of peaks and a thermal component (T 2 × 107 K).In the early phase, the source images for the impulsive component were available simultaneously at soft (7–14 keV) and hard (20–40 keV) X-rays. Both sources are elongated along a neutral line. The core of the source for the hard X-rays is located at one end which seems to be a footpoint (or a leg) of a loop or arcade, while the core for the soft X-rays is located at the center of the elongated source which would be the center of the loop. The core for the hard X-rays shifted to this center in the main and later phase, accompanied by decrease in the source size in the later phase.A peak of one-directional intensity distribution at 35 GHz always lies on the core of the hard X-ray source, showing a shift of the position synchronous with the hard X-ray core. This may imply a common source for the radio waves and the hard X-rays.The source of the thermal component observed at the soft X-rays (7–14 keV) after the early phase covers a whole H patches. This may imply a physical relation between the thermal X-ray loops and the H brightening. |
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