Plasmaspheric drainage plumes: Inner-magnetospheric coupling from the IMAGE/EUV perspective

Details Plasmaspheric drainage plumes: Inner-magnetospheric coupling from the IMAGE/EUV perspective Plasmaspheric drainage plumes: Inner-magnetospheric coupling from the IMAGE/EUV perspective

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm43b..07a&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM43B-07

Mathematics

Probability

2712 Electric Fields (2411), 2740 Magnetospheric Configuration And Dynamics, 2760 Plasma Convection (2463), 2768 Plasmasphere, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Plasmaspheric drainage plumes appear in the aftermath of periods of enhanced convection/erosion and are interpreted as a near-equatorial signature of the redistribution of thermal plasma along streamlines. Analysis of IMAGE/EUV observations from "First Light" through the end of calendar year 2002 reveals that for Kp ≥ 3, there is an 84% probability of observing a plasmaspheric plume in EUV data. We present a statistical analysis of the geomagnetic conditions [Kp, Dst, and solar wind-induced electric field] associated with EUV plume observations. This analysis yields a peak in observational probability when Kp = 4 and Dst = -50 nT. Additionally, EUV plume observations are associated with a solar wind-induced convection electric field at Earth [EY,SM] characterized by bi-modal behavior with a positive node peaked at ~ 4 mV·m-1 and a negative node that peaks at -2 mV·m-1. Analysis of the time rate of change of the plume-associated EY,SM indicates that once the mechanism for plume formation is initiated, a slowly changing convection environment is required to allow for sufficient plume development prior to EUV detection.

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