Solar cycle effect on Pc 3 geomagnetic pulsations

Details Solar cycle effect on Pc 3 geomagnetic pulsations Solar cycle effect on Pc 3 geomagnetic pulsations

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...101.2461v&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A2, p. 2461-2466

Physics

4

Magnetospheric Physics: Mhd Waves And Instabilities, Ionosphere: Midlatitude Ionosphere, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Plasmasphere

Scientific paper

Hypotheses about long-period variations (i.e., seasonal, annual, and solar cycle) of geomagnetic pulsations have existed since the intensive research started. Nevertheless, insufficiently long data series prevented a conclusive and unambiguous detection of such variations. The Nagycenk observatory (Hungary) at an L value slightly below 2 has a pulsation time series including three solar cycles. Based on these data, period changes of Pc 3 pulsations are presented here, and an indirect connection with the yearly variation of the pulsation activity is supposed, both being due to changes of the magnetospheric plasma density. Longer periods of the pulsations around solar activity maxima should be due to higher particle concentrations at the respective shell of field lines, while 11-year average periods are influenced by long-term changes of the interplanetary magnetic field.

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