Multi-Point Electric Field Observations in the High-Altitude Cusp Region

Details Multi-Point Electric Field Observations in the High-Altitude Cusp Region Multi-Point Electric Field Observations in the High-Altitude Cusp Region

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm12c..09l&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM12C-09

Physics

2712 Electric Fields (2411), 2724 Magnetopause, Cusp, And Boundary Layers, 2728 Magnetosheath, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

In January-April 2001 the Cluster quartet crossed the cusp region twice per their 56 hours orbital period. These cusp encounters occurred at high altitudes, usually above 8 RE distance. Basically these encounters can be categorized into two groups. The first group consists of crossings where the satellites enter and exit the cusp at a rather constant altitude so that the satellites exit/enter the cusp through the entry layer, on the equatorial side of the cusp, and the plasma mantle, on the poleward side of the cusp. In the second group, the satellites' movement is quite parallel with respect to cusp orientation so that their altitude changes quickly with a rather constant latitude, and then the satellites enter/exit the cusp through the exterior cusp, in the magnetosheath just above the cusp. In this study we will investigate multi-point measurements with the Cluster electric field instrument (EFW) which let us study both plasma drift patterns and electron density variations (from the spacecraft potential data) within the cusp region. We also utilize simultaneous ion, electron, and magnetic field measurements that are important observations for our effort to interpret the EFW data. In particular we attempt to investigate both dynamical and structural aspects of the cusp, as with multi-point observations we have a chance to separate spatial and temporal features from the data.

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