Physics – Plasma Physics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990stin...9116974n&link_type=abstract
Unknown
Physics
Plasma Physics
Earth Magnetosphere, Electron Distribution, Ion Distribution, Neutral Sheets, Ampte (Satellites), Ion Beams, Plasma Physics, Radial Distribution, Velocity Distribution
Scientific paper
A survey of the three dimensional ion and electron distributions measured on AMPTE/IRM near the neutral sheet in the near Earth magnetotail is presented. The data is classified according to substorm phases. Individual case studies of velocity distributions reveal that the ions in the neutral sheet consist of a single population. Fast and slow flows both occur during the two extremes of the magnetospheric activity, the substorm expansion phase and quiet times. Ion beams are occasionally observed and their shapes in velocity space are similar to those observed in the plasma sheet boundary layer. A ring distribution is seen only twice in fifty events. The occurrence rate of fast flow is positively correlated with the global magnetic field elevation during disturbed times and anticorrelated with that elevation during quiet times. The global magnetic field elevation angle is related to the magnetic field configuration in the magnetotail. These results indicate a dependence of the flow speed within the neutral sheet on the magnetotail configuration at the point of observation.
Baumjohann Wolfgang
Nakamura Maho
Paschmann Goetz
Sckopke Norbert
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