Elevated ion density at geosynchronous orbit during sustained northwards IMF.

Details Elevated ion density at geosynchronous orbit during sustained northwards IMF. Elevated ion density at geosynchronous orbit during sustained northwards IMF.

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm11b0320d&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM11B-0320

Physics

2700 Magnetospheric Physics (6939), 2760 Plasma Convection (2463), 2764 Plasma Sheet

Scientific paper

Data from seven magnetospheric plasma analyser (MPA) instruments on-board satellites in geosynchronous orbit, used in conjunction with interplanetary magnetic field (IMF) data taken upstream of the Earth, provide evidence of magnetospheric preconditioning during events of sustained northwards IMF. Previous reports have found little evidence of enhanced densities of medium energy ions (0.1-45 keV) close to local noon regardless of the strength of convection. We present evidence of a clear factor of two difference between ion densities on the dayside during sustained periods of northwards IMF and similar periods of southwards IMF. This effect is likely to be a contributary factor in the preconditioning of the magnetosphere which can occur prior to some of the largest geomagnetic storms.

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