Detailed determination of the orientation and motion of the plasma sheet boundary layer using energetic protons on ISEE 1 and 2 - Waves, curves, and flapping

Details Detailed determination of the orientation and motion of the plasma sheet boundary layer using energetic protons on ISEE 1 and 2 - Waves, curves, and flapping Detailed determination of the orientation and motion of the plasma sheet boundary layer using energetic protons on ISEE 1 and 2 - Waves, curves, and flapping

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.7376k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, July 1, 1988, p. 7376-7385.

Physics

11

International Sun Earth Explorers, Magnetic Equator, Planetary Boundary Layer, Plasma Layers, Proton Energy, Remote Sensing, Data Flow Analysis, Energetic Particles, Geomagnetic Tail, Magnetic Storms

Scientific paper

The behavior of the plasma sheet boundary during the early phase of a geomagnetic substorm on April 12, 1979, was investigated using a combination of the dual-satellite method and an enhanced remote-sensing technique based on the method of Daly and Keppler(1983), and energetic proton data from the medium energy particle experiment on board the ISEE 1 and 2 spacecraft and from triaxial flux-gate magnetometers. Using this technique, it was possible to measure the speed and the orientation of the plasma sheet surface simultaneously. It is shown that, during this substorm, the plasma sheet boundary was oriented more than 45 deg to the geocentric solar magnetospheric equator and had a speed normal to its surface of the order of tens of kilometers per second in the dawn direction. The ion flux gradient scale length at the boundary is estimated to be a few hundred kilometers. The orientation of the subsequent exit and reentry were such as to indicate curvature of the plasma sheet surface on the order of several thousand kilometers, with the whole surface structure moving in the dawn direction at the speed of about 70 km/s.

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