Preconditioning of the Magnetosphere by Calms before the Storm

Details Preconditioning of the Magnetosphere by Calms before the Storm Preconditioning of the Magnetosphere by Calms before the Storm

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm22a..07b&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM22A-07

Physics

2159 Plasma Waves And Turbulence, 2164 Solar Wind Plasma, 2169 Solar Wind Sources, 2788 Magnetic Storms And Substorms (7954), 7900 Space Weather

Scientific paper

Intervals of extreme geomagnetic calm occur just prior to 66% of all recurring high-speed-stream-driven storms and just prior to 38% of CME-driven storms. An interval of calm prior to the onset of a storm can precondition the magnetosphere, resulting in a change in the nature of the storm. We will focus on changes in the storms caused by the build up of a large plasmasphere and the build up of cool dense plasma sheet (CDPS) plasma in the magnetosphere. We argue that the built-up plasmasphere during the calm and the resulting plasmaspheric drainage plume during the storm leads to (1) mass loading of the dayside neutral line causing a reduction in solar-wind/magnetosphere coupling during the storm, (2) enhanced decay of the number density of relativistic electrons in the outer radiation belt prior to the storm, (3) a dumping of the outer electron radiation belt by the formation of a clumpy plasmaspheric drainage plume in the early phase of the storm, and (4) mass loading of convection in the inner magnetosphere. We argue that the build up of CDPS plasma in the magnetosphere during a calm provides a more efficient fuel for the production of ring current during the early phase of the storm.

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