The universal time variation of geomagnetic activity

Details The universal time variation of geomagnetic activity The universal time variation of geomagnetic activity

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..555r&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, June 1989, p. 555-558.

Physics

13

Annual Variations, Diurnal Variations, Geomagnetism, Magnetic Variations, Magnetoactivity, Universal Time, Interplanetary Magnetic Fields, Magnetic Field Reconnection, Solar Wind

Scientific paper

Geomagnetic activity exhibits both annual and daily variations. These variations are examined in the Am index which was designed to provide an accurate measure of the UT variation of geomagnetic activity. The dayside reconnection process can quantitatively account for the observed variation in both indices. Control of these variations by the angle of the flow relative to the dipole axis is weaker than control by reconnection.

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