Seasonal trend of geomagnetic activity derived from solar-terrestrial geometry confirms an axial-equinoctial theory and reveals deficiency in planetary indices.

Details Seasonal trend of geomagnetic activity derived from solar-terrestrial geometry confirms an axial-equinoctial theory and reveals deficiency in planetary indices. Seasonal trend of geomagnetic activity derived from solar-terrestrial geometry confirms an axial-equinoctial theory and reveals deficiency in planetary indices.

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jatp...58.1497l&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, Vol. 58, No. 13, p. 1497 - 1506

Physics

Earth Magnetosphere: Solar Wind, Geomagnetic Field: Activity, Geomagnetic Field: Solar Wind, Geomagnetic Field: Solar-Terrestrial Relations

Scientific paper

At the magnetopause, solar wind plasma interacts with the terrestrial magnetic field, with the consequent entry of solar wind energy into the magnetosphere and the ionosphere. Geomagnetic activity is one of the results. Planetary geomagnetic indices, e.g. Kp, Ap, Am, etc, have been designed to measure solar particle radiation by its magnetic effects. Long-term averages of these indices have established that solar wind energy input into the ionosphere maximizes around equinoctial months with minima around the solstices. Although considerable progress has been made to explain qualitatively the semiannual variation of geomagnetic activity, its component parts, representing the axial and equinoctial hypotheses, have not so far been put together with a high degree of quantitative precision. This paper demonstrates that the semiannual trend of geomagnetic activity can be reproduced quantitatively with good precision by using accurate astronomical data relating to the Sun-Earth geometry.

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