Geomagnetic activity associated with earth passage of interplanetary shock disturbances and coronal mass ejections

Details Geomagnetic activity associated with earth passage of interplanetary shock disturbances and coronal mass ejections Geomagnetic activity associated with earth passage of interplanetary shock disturbances and coronal mass ejections

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.7831g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, May 1, 1991, p. 7831-7839. DOE-sponsored research.

Physics

239

Shock Waves, Solar Activity Effects, Solar Corona, Solar Wind, Stellar Mass Ejection, Interplanetary Magnetic Fields, Magnetic Storms, Magnetoactivity, Solar Electrons

Scientific paper

Coronal mass ejection events (CMEs) are important occasional sources of plasma and magnetic field in the solar wind at 1 AU, accounting for approximately 10 percent of all solar wind measurements in the ecliptic plane during the last solar activity maximum. Using a recently appreciated capability for distinguishing CMEs in solar wind data in the form of counterstreaming solar wind electron events, this paper explores the overall effectiveness of shock wave disturbances and CMFs in general in stimulating geomagnetic activity. The study is confined to the interval from mid-August 1978 through mid-October 1982, spanning the last solar activity maximum, when ISEE 3 was in orbit about the L1 Lagrange point 220 Re upstream from earth. It is found that all but one of the 37 largest geomagnetic storms in that era were associated with earth passage of CMEs and/or shock disturbances, with the large majority of these storms (27 out of 37) being associated with interplanetary events where earth encountered both a shock and the CME driving the shock (shock/CME events). Although CMEs and/or shock disturbances were increasingly the cause of geomagnetic activity as the level of geomagnetic activity increased, many smaller geomagnetic disturbances were unrelated to these events.

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