Coronal mass ejections and large geomagnetic storms | Zendy

Gosling J. T. | Zendy; Bame S. J. | Zendy; McComas D. J. | Zendy; Phillips J. L. | Zendy

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Coronal mass ejections and large geomagnetic storms

Author(s) -

Gosling J. T.,

Bame S. J.,

McComas D. J.,

Phillips J. L.

Publication year - 1990

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/gl017i007p00901

Subject(s) - coronal mass ejection , geomagnetic storm , solar wind , interplanetary spaceflight , physics , earth's magnetic field , geophysics , interplanetary medium , space weather , solar energetic particles , astronomy , astrophysics , atmospheric sciences , magnetic field , quantum mechanics

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, we find that most large geomagnetic storms during the interval surrounding the last solar maximum (Aug. 1978 – Oct. 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 wind ahead were particularly ineffective in a geomagnetic sense.

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