Galileo observations of the motions of ion and electron plasmas in the magnetotail

Details Galileo observations of the motions of ion and electron plasmas in the magnetotail Galileo observations of the motions of ion and electron plasmas in the magnetotail

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1771f&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 17, p. 1771-1774.

Physics

6

Electron Plasma, Galileo Spacecraft, Geomagnetic Tail, Ion Motion, Plasma Dynamics, Field Aligned Currents, Three Dimensional Models

Scientific paper

A series of simultaneous determinations is presented of the 3D bulk flows of ion and electron plasmas in the magnetotail at radial distances near the lunar orbit. In the plasma mantle the ion and electron bulk velocities are identical within measurement accuracy. In the plasma sheet the electron bulk flows, densities, and temperatures are consistent with the results of the previous ISEE-3 survey at these radial distances as given by Zwickl et al. (1984). The present observations show that the electron bulk flows are often dominantly field-aligned and attributable to field-aligned currents, not convective motions within the magnetotail. The E x B convection of the plasmas as determined directly from the ion observation is often significantly slower and/or in a different direction than the bulk motions of either the ion or the electron plasmas. Thus, the ISEE-3 observations of electron bulk flows cannot be reliably used as measures of the E x B convection of plasmas or ion bulk motions at these distances in the plasma sheet.

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