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Interplanetary Consequences of Transient Coronal Events Observed with YOHKOH SXT: A Case Study of Polar Coronal Transient on 15 May 1992

Published online by Cambridge University Press:  12 April 2016

T. Watanabe ,
Y. Nakagawa  and
M. Kojima
T. Watanabe
Affiliation:
Department of Environmental Sciencies, Ibaraki University, 310 Mito, Japan
Y. Nakagawa
Affiliation:
Department of Environmental Sciencies, Ibaraki University, 310 Mito, Japan
M. Kojima
Affiliation:
Solar-terrestrial Environment Laboratory, Nagoya University, Toyokawa 442, Japan

Abstract

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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.

Type
IPS and Other Remote Sensing Measurements
Information
International Astronomical Union Colloquium , Volume 154: Solar and Interplanetary Transients , 1996 , pp. 239 - 245
Copyright
Copyright © Kluwer 1997

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