Interplanetary consequences of transient coronal events observed with yohkoh sxt: A case study of polar coronal transient on 15 may 1992 |
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Authors: | T Watanabe Y Nakagawa M Kojima |
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Institution: | (1) Department of Environmental Sciences, Ibaraki University, 310 Mito, Japan;(2) Solar-terrestrial Environment Laboratory, Nagoya University, 442 Toyokawa, Japan |
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Abstract: | A large area (5×1010km2) of a coronal hole disappeared in concert with a transient brightening of a nearby high-latitude coronal arcade in the northern hemisphere on 15 May 1992. This coronal-hole disappearance took place in a time scale of half a day. It is suggested that the large-scale and quick change in coronal-hole geometry induced the eruption of originally closed coronal magnetic structure of the high-latitude arcade. An associated solar wind disturbance with the plasma speed of >700 km/sec was observed by IPS, and geomagnetic sudden commencement was reported on 18 May 1992. |
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