The Boller-Stolov mechanism and the semiannual and daily McIntosh effects in geomagnetic activity

Details The Boller-Stolov mechanism and the semiannual and daily McIntosh effects in geomagnetic activity The Boller-Stolov mechanism and the semiannual and daily McIntosh effects in geomagnetic activity

Mar 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.1266m&link_type=abstract

Journal of Geophysical Research, vol. 82, Mar. 1, 1977, p. 1266-1270.

Physics

4

Annual Variations, Geomagnetism, Magnetic Variations, Solar Wind, Earth Axis, Kelvin-Helmholtz Instability, Solar Longitude

Scientific paper

Daily and semiannual variations of the McIntosh effect are analyzed using an expression given by Boller and Stolov (1974). Average values of aa indices for the years 1868 to 1970 are computed for 6-deg-wide sectors of solar longitude, three-hour averages of am index within each sector are examined, and daily variations in residuals are discussed. It is argued that the variations of the McIntosh effect are caused by a physical mechanism related to variations in the angle between the solar wind and earth's dipole axis, as suggested by Boller and Stolov.

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