Abstract
Intense geomagnetic storms with DST index ≤-100 nT were recorded on 9 March and 11 March 1993 associated with solar activity on 6 March and 9-10 March, 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 6 March 1993 and in the other case, to two large filament disruptions on the disk during 9-10 March, 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.
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Srivastava, N., Gonzalez, W.D., Gonzalez, A.L. et al. On the Solar Origins of Intense Geomagnetic Storms Observed During 6–11 March 1993. Solar Physics 183, 419–434 (1998). https://doi.org/10.1023/A:1005018328191
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DOI: https://doi.org/10.1023/A:1005018328191