Substorm-related plasma sheet motions as determined from differential timing of plasma changes at the ISEE satellites

Details Substorm-related plasma sheet motions as determined from differential timing of plasma changes at the ISEE satellites Substorm-related plasma sheet motions as determined from differential timing of plasma changes at the ISEE satellites

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.3459f&link_type=abstract

Journal of Geophysical Research, vol. 86, May 1, 1981, p. 3459-3469. Research sponsored by the U.S. Department of Energy; Bunde

Physics

29

Electron Transfer, International Sun Earth Explorers, Magnetic Storms, Plasma Dynamics, Plasma Layers, Space Plasmas, Boundary Layers, Magnetohydrodynamic Flow, Magnetospheric Proton Density, Plasma Waves, Time Lag, Velocity Distribution, Wave Propagation, Waveforms, Wavelengths

Scientific paper

From an ISEE survey of substorm dropouts and recoveries during the period February 5 to May 25, 1978, 66 timing events observed by the Los Alamos Scientific Laboratory/Max-Planck-Institut Fast Plasma Experiments were studied in detail. Near substorm onset, both the average timing velocity and the bulk flow velocity at the edge of the plasma sheet are inward, toward the center. Measured normal to the surface of the plasma sheet, the timing velocity is 23 + or - 18 km/s and the proton flow velocity is 20 + or - 8 km/s. During substorm recovery, the plasma sheet reappears moving outward with an average timing velocity of 133 + or - 31 km/s; however, the corresponding proton flow velocity is only 3 + or - 7 km/s in the same direction. It is suggested that the difference between the average timing velocity for the expansion of the plasma sheet and the plasma bulk flow perpendicular to the surface of the sheet during substorm recovery is most likely the result of surface waves moving past the position of the satellites.

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