Coronal mass ejections and large geomagnetic storms

Details Coronal mass ejections and large geomagnetic storms Coronal mass ejections and large geomagnetic storms

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..901g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, June 1990, p. 901-904. Research supported by DOE.

Physics

99

Magnetic Disturbances, Magnetic Storms, Solar Corona, Solar Terrestrial Interactions, Solar Wind Velocity, Stellar Mass Ejection, Interplanetary Magnetic Fields, Solar Atmosphere

Scientific paper

Previous work indicates that coronal mass ejection (CME) events in the solar wind at 1 AU can be identified by the presence of a flux of counterstreaming solar wind halo electrons (above about 80 eV). Using this technique to identify CMEs in 1 AU plasma data, it is found that most large geomagnetic storms during the interval surrounding the last solar maximum (August 1978 - October 1982) were associated with earth-passage of interplanetary disturbances in which the earth encountered both a shock and the CME driving the shock. However, only about one CME in six encountered by earth was effective in causing a large geomagnetic storm. Slow CMEs which did not interact strongly with the ambient solar wind ahead were particularly ineffective in a geomagnetic sense.

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