Filamentary structures in the magnetotail lobes

Details Filamentary structures in the magnetotail lobes Filamentary structures in the magnetotail lobes

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.2349h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, March 1, 1987, p. 2349-2363.

Physics

48

Auroral Arcs, Energetic Particles, Geomagnetic Tail, Magnetic Field Configurations, Plasma Layers, Polar Caps, Boundary Value Problems, Field Aligned Currents, International Sun Earth Explorers, Polar Orbits

Scientific paper

The observations of plasmas which may be the source population for polar cap arcs are reported. This population consists of energetic plasma contained within filamentary structures aligned approximately parallel to the XZ plane. Using a combination of plasma, particle, and magnetic field data for several events, it is established that the filaments have their origin in the plasma sheet or its adjacent boundary layer, and that the structures protrude into the lobe region. In a number of cases, a correlation between the convection pattern and the IMF B(Z) can be inferred. This is in agreement with the observed characteristics of polar cap arcs, observations of which are correlated with a northward directed IMF. The presence of field-aligned currents suggests that field-aligned acceleration may occur between the observing satellite and earth.

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