Cold Plasma Flow in the Tail Inferred from Satellite Wake

Details Cold Plasma Flow in the Tail Inferred from Satellite Wake Cold Plasma Flow in the Tail Inferred from Satellite Wake

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm33b0353e&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM33B-0353

Statistics

2744 Magnetotail, 2776 Polar Cap Phenomena, 2794 Instruments And Techniques, 7807 Charged Particle Motion And Acceleration, 7855 Spacecraft Sheaths, Wakes, Charging

Scientific paper

Ions with lower energy than the spacecraft potential, which commonly reaches tens of eV in the tenuous geomagnetic tail lobes, cannot reach the spacecraft. This population is therefore normally invisible on satellites, unless special means are taken to lower the spacecraft potential by ion or plasma emitters We show that the very large ion wake forming behind a highky positive spacecraft in a tenuous plasma can be used to determine the velocity of these otherwise invisible ion flows. Wake characteristics are established by computer simulations, and data from the Cluster satellites confirm the simulation results. The wake is determined in space by comparison of electric field measurements obtained by double-probes and electron drift instruments, from which the flow velocity is readily derived. Initial statistics from Cluster show abundant cold ion flows in the tail lobes.

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