Cusp Electron and Ion Structures Observed by FAST

Details Cusp Electron and Ion Structures Observed by FAST Cusp Electron and Ion Structures Observed by FAST

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm12b..11s&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM12B-11

Physics

2724 Magnetopause, Cusp, And Boundary Layers, 2736 Magnetosphere/Ionosphere Interactions, 2740 Magnetospheric Configuration And Dynamics

Scientific paper

The high-time resolution observations by FAST resolve burst-like electrons and nonmonotonic ion dispersion in the cusp region. The burst-like precipitating electrons are correlated with electric field variations in the frequency range of 0.2-1Hz, which are most easily explained as propagating Alfven waves. Alfven waves cause strong ion heating and outflow in the polar cap boundary acceleration region (dayside polar cusp and near-midnight polar cap boundary). Ion structures are associated with the direction and/or magnitude of the drift velocity which is in the opposite direction of the magnetic field perturbation in the Northern Hemisphere. From this it can be concluded that magnetosheath ion structures are a result of the spacecraft crossing flow streamlines. Each flow channel has its own history of dayside reconnection, therefore, the magnetosheath ion structures contain information of both the spatial and temporal variations of dayside reconnection.

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