Physics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998soph..183..419s&link_type=abstract
Solar Physics, v. 183, Issue 2, p. 419-434 (1998).
Physics
7
Scientific paper
Intense geomagnetic storms with DST index <= -100nT were recorded on 9March and 11March 1993 associated with solar activity on 6March and 9-10March, respectively. In this paper, we discuss the characteristic features of the solar origins of the two events that gave rise to coronal and interplanetary disturbances and as a consequence produced strong geomagnetic activity at the Earth. The source of the activity in one case is attributed to a major 3M7.0 flare that occurred on 6March 1993 and in the other case, to two large filament disruptions on the disk during 9-10March, 1993. Both these sources were found to be located near changing or varying low-latitude coronal holes. They were also located close to the heliospheric currents sheets. Distinct X-ray activity was observed for both the events as observed by the Yohkoh SXT telescope. The detailed evolution and a comparison of these events on the basis of Yohkoh soft X-ray observations are presented here.
Gonzalez Alicia L. C.
Gonzalez Walter D.
Masuda Satoshi
Srivastava Nandita
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