Asymmetry in seasonal variations of geomagnetic activity

Details Asymmetry in seasonal variations of geomagnetic activity Asymmetry in seasonal variations of geomagnetic activity

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm51b0531b&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM51B-0531

Other

2447 Modeling And Forecasting, 2772 Plasma Waves And Instabilities (2471), 2784 Solar Wind/Magnetosphere Interactions, 2788 Magnetic Storms And Substorms (7954), 4430 Complex Systems

Scientific paper

Seasonal variations in geomagnetic activity were studied for the period of 1990-2007 using Dst and AE indices. Over 150 events characterised by the increase in geomagnetic activity of varying strength (from -90nT up to -1800 nT) were statistically analysed. Although Russell -McPherron effect plays major role in the equinoctial asymmetry in the geomagnetic activity, other effects may also take place. During this study we found a statistically significant October-November peak in geomagnetic activity for Northern Hemisphere, which is sufficiently larger than March- April peak. Several hypotheses for the cause of such effect are discussed.

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