Eruptive prominences and long-delay geomagnetic disturbances

Details Eruptive prominences and long-delay geomagnetic disturbances Eruptive prominences and long-delay geomagnetic disturbances

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985basi...13..231s&link_type=abstract

Astronomical Society of India, Bulletin, vol. 13, Sept. 1985, p. 231-242.

Astronomy and Astrophysics

Astronomy

Magnetic Disturbances, Solar Prominences, Solar Terrestrial Interactions, Solar Wind, Magnetic Variations, Solar Corpuscular Radiation, Solar Limb, Time Lag, Twenty-Seven Day Variation

Scientific paper

From a study of the interplanetary plasma and magnetic field data at 1 AU, and of geomagnetic activity in relation to solar eruptive prominences at the limb, (EPLs), it is shown that the geomagnetic disturbances (of Ap equal to or greater than 30) that follow EPLs with long delays (8-12 days) are essentially caused by the transit of high-speed streams in the solar wind at the earth. A significant number (55 percent) of the streams and the enhancement in geomagnetic activity associated with them exhibit the approximately 27-day recurrence pattern. The delay time, intensity, and persistance of the geomagnetic disturbances do not show a systemic dependence on the importance of the EPLs. The results strongly suggest that the recently reported relationship between EPLs and long-delay geomagnetic disturbances (Wright, 1983) stems from fortuitous temporal association between EPLs and the passage of high-speed solar wind streams at the earth, and that EPLs do not constitute a unique solar source of long-delay geomagnetic disturbances.

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