Three-satellite measurements and field-line mapping of the outer plasma sheet boundary from r equal to approximately 1.2 to approximately 18 earth radii during substorms

Details Three-satellite measurements and field-line mapping of the outer plasma sheet boundary from r equal to approximately 1.2 to approximately 18 earth radii during substorms Three-satellite measurements and field-line mapping of the outer plasma sheet boundary from r equal to approximately 1.2 to approximately 18 earth radii during substorms

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..585p&link_type=abstract

Geophysical Research Letters, vol. 5, July 1978, p. 585-588. Research supported by the Norges Teknisk-Naturvitenskapelige Forsk

Physics

Lines Of Force, Magnetospheric Instability, Plasma Layers, Satellite Observation, Energy Spectra, Geomagnetic Tail, Polar Substorms, Time Response

Scientific paper

Simultaneous and near-conjugate observations of energetic particles in the outer region of the plasma sheet by three satellites (Esro 1A, Ogo 5, and Vela 5B) show clear indications of a close relationship between the instantaneous latitudinal location of the high-latitude precipitation boundary at 1000 to 1500 km height and the thickness of the plasma sheet at geocentric distances of 10 to 18 earth radii. A comparison of low-altitude and magnetotail particle energy spectra and the use of recent magnetospheric field-line models as spatial reference systems seems to indicate that the precipitation boundary and the outer plasma sheet boundary are magnetically connected. The correlation between plasma sheet recovery and a poleward expansion of the precipitation boundary from approximately 70 deg to approximately 75 deg magnetic latitude late in substorms suggests that this recovery is associated with rapid magnetic field-line reconnection as the reconnection region apparently moves to a more distant location in the tail.

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