Plasmapause response to geomagnetic storms: CRRES results

Physics

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Magnetospheric Physics: Plasmasphere, Magnetospheric Physics: Magnetosphere-Inner, Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Magnetospheric Configuration And Dynamics

Scientific paper

The response of the plasmapause following a geomagnetic storm is examined statistically using plasmapause observations made by the Combined Release and Radiation Effects Satellite (CRRES) plasma wave receiver instrument. The plasmapause was identified as the inner most steep density gradient. Due to CRRES' 10-hour orbital period, the plasmapause is generally sampled at two distinct local time sectors each orbit. The results from a study of 22 storms (with minimum Dst < -30 nT) show that the plasmapause generally moves earthward one L in the night and dawnside following a storm sudden commencement but is highly variable and statistically moves out in the dusk sector. This new result emphasizes that the plasmapause can have significant local time asymmetries that are amplified due to storm dynamics.

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