Geomagnetic response to magnetic clouds

Details Geomagnetic response to magnetic clouds Geomagnetic response to magnetic clouds

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35..329w&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 35, March 1987, p. 329-335. NASA-USAF-supported research.

Computer Science

39

Geomagnetism, Magnetic Clouds, Magnetic Storms, Solar Terrestrial Interactions, Bubbles, Equatorial Atmosphere, Interplanetary Magnetic Fields, Solar Corona, Statistical Analysis, Stellar Mass Ejection

Scientific paper

Results of superimposed epoch analyses of hourly values of the equatorial Dst geomagnetic index and the B(x) component of the interplanetary magnetic field are given for 19 magnetic clouds. Results show statistical associations between magnetic clouds and geomagnetic storms, and between clouds without preceding shocks and gradual commencements. It was found that 75 percent of the clouds had a maximum Dst of less than -30 gammas, and that 95 percent of the clouds had a maximum Dst of less than about -16 gammas. In the main phase and recovery phase of geomagnetic storms, the Dst index simultaneously decreases to a large negative value at the onset of a large sustained southward magnetic field, and recovery starts when the magnetic field becomes northward.

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