Properties of Cold Plasma Flow in the Magnetotail

Details Properties of Cold Plasma Flow in the Magnetotail Properties of Cold Plasma Flow in the Magnetotail

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm31b1719e&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM31B-1719

Physics

2736 Magnetosphere/Ionosphere Interactions (2431), 2744 Magnetotail, 2760 Plasma Convection (2463), 2776 Polar Cap Phenomena, 2794 Instruments And Techniques

Scientific paper

Cold ionospheric ions (energy below a few tens of eV) in the tenuous magnetotail lobes are difficult to measure by particle detectors due to the high spacecraft potential (tens of volts). Consequently, few studies exist of plasma flows like the polar wind above a few thousand km altitude. By combining data from two different electric field instruments we can study the formation of a wake behind the Cluster satellites, to show the existence of cold plasma flows and to determine their flow velocity. Combining with plasma density from the spacecraft potential, we also get the ion flux. The database thus obtained vastly exceeds any previous study of cold magnetotail ions. We present maps of the cold ion density, velocity and flux in the tail lobes, showing that the cold plasma flows observed at a few thousands of km altitude continue at least as far as the Cluster apogee around 20 RE.

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