Multiple-satellite studies of magnetospheric substorms - Radial dynamics of the plasma sheet

Details Multiple-satellite studies of magnetospheric substorms - Radial dynamics of the plasma sheet Multiple-satellite studies of magnetospheric substorms - Radial dynamics of the plasma sheet

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.5921p&link_type=abstract

Journal of Geophysical Research, vol. 81, Dec. 1, 1976, p. 5921-5933. ERDA-supported research

Physics

4

Geomagnetic Tail, Magnetospheric Instability, Plasma Flux Measurement, Polar Substorms, Satellite Observation, Geomagnetic Pulsations, Magnetic Signatures, Magnetohydrodynamic Flow, Neutral Sheets, Ogo-5, Plasma Dynamics, Radial Flow, Vela Satellites

Scientific paper

The radial dynamics of the nighttime plasma sheet during substorms is examined. The spatial dependence of plasma sheet variations at different radial distances is studied on the basis of simultaneous recordings from two closely spaced satellites. The simultaneous measurements of the plasma sheet behavior earthward and tailward of r = 15 earth radii confirm substorm models which predict a thinning of the near-earth plasma sheet before the formation of an X-type neutral line, followed by a thickening on the earthward side and a further thinning on the tailward side. Temporal correlations between the plasma sheet variations and substorm development on the ground are studied by obtaining accurate timing of individual substorm expansion onsets. In particular, during multiple onset storms, the near-earth plasma sheet is found to experience a series of multiple expansions and contractions, which usually occur in a one-to-one relationship with ground Pi 2 bursts and are well correlated with auroral zone and low-altitude magnetic disturbances.

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