Transition from slow flow to fast tailward flow in the distant plasma sheet

Details Transition from slow flow to fast tailward flow in the distant plasma sheet Transition from slow flow to fast tailward flow in the distant plasma sheet

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2939n&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 25, p. 2939-2942

Physics

14

Flow Velocity, Geomagnetic Tail, Magnetohydrodynamic Flow, Plasma Layers, Satellite Observation, Solar Wind, Space Plasmas, Geophysical Satellites, Ion Distribution, Planetary Magnetic Fields, Plasma Potentials

Scientific paper

Transitions from slow to fast tailward flow are studied in the distant plasma sheet at downtail distances of approximately 70 R(sub e) with the data from the GEOTAIL satellite. The speed of 300 km/s can be regarded as a reasonable measure that separates the fast and the slow flow. While the magnetic field tends to be northward during the slow flow, its polarity oscillates between northward and southward during the fast tailward flow. A case is studied in detail where the slow-to-fast transition of the flow velocity was observed when the spacecraft was very close to the neutral sheet, and it is seen that the pressure was balanced in the interface region between these flows. The observations are consistent with a model in which the fast tailward flow is associated with a plasmoid and the quiet plasma is pushed forward when a plasmoid approaches.

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