The normal, thickness, and speed of the dusk magnetopause from Cluster Electric Field and Wave experiment measurements

Details The normal, thickness, and speed of the dusk magnetopause from Cluster Electric Field and Wave experiment measurements The normal, thickness, and speed of the dusk magnetopause from Cluster Electric Field and Wave experiment measurements

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm61a06b&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM61A-06

Physics

2712 Electric Fields (2411), 2724 Magnetopause, Cusp, And Boundary Layers

Scientific paper

We present a measurement of the normal, thickness, and speed of the dusk magnetopause using data from Electric Field and Wave (EFW) experiment at 39 magnetopause encounters by the four Cluster satellites during a single event. EFW measures the potential between spherical probe sensors and the body of the spacecraft. This spacecraft potential is related functionally to the ambient thermal electron current; as such, it gives a primary signature of the magnetopause. We use a timing analysis on the 4 spacecraft data and obtain a system of equations which is solved by regression for the boundary normal vector and speed. This analysis assumes a locally planar magnetopause with its velocity vector colinear with the normal. Magnetopause speeds range from 20 to 200 km/s and current layer thicknesses from 200 to 1200 km. The characteristic time between successive magnetopause encounters suggests a relationship to magnetospheric Pc-5 modes and we discuss the results in the context of an operative Kelvin-Helmholtz instability on the flank magnetopause.

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