Occurrence statistics of cold, streaming ions in the near-Earth magnetotail

Details Occurrence statistics of cold, streaming ions in the near-Earth magnetotail Occurrence statistics of cold, streaming ions in the near-Earth magnetotail

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm21a0447l&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM21A-0447

Statistics

2431 Ionosphere/Magnetosphere Interactions (2736), 2736 Magnetosphere/Ionosphere Interactions, 2744 Magnetotail, 2764 Plasma Sheet

Scientific paper

Results are presented from a survey of cold ion observations in the near-Earth magnetotail using data from the Polar Thermal Ion Dynamics Experiment (TIDE). During the interval from July to December of 2001, Polar had its apogee ( ˜ 9.5 RE) near the equatorial plane in the tail region of the magnetosphere. It is shown that a lobal wind is ubiquitous in the inner tail, with low-energy (< 300 eV) ions streaming from the ionosphere downtail. In addition to the results of a survey of the occurrence statistics of these streaming ions, several example case studies of moments and distribution functions are presented. These lobal winds often pass through the plasma sheet, forming bi-directional streams, in addition to the uni-directional beams seen at higher magnetic latitudes. The observance of bi-directional streams is inversely correlated with geomagnetic activity. It is inferred from the universality of these observations during Polar's passage through the inner tail region that the ionosphere is a continuous supplier of plasma to the near-Earth magnetosphere.

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