Plasma characteristics near exterior cusp under different orientation of interplanetary magnetic field.

Details Plasma characteristics near exterior cusp under different orientation of interplanetary magnetic field. Plasma characteristics near exterior cusp under different orientation of interplanetary magnetic field.

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999czjph..49..711f&link_type=abstract

Czech. J. Phys., Vol. 49, No. 4a, p. 711 - 732

Physics

5

Earth Magnetosphere: Interplanetary Magnetic Field

Scientific paper

The authors present the high-altitude observations of plasma flow in the poleward region of the exterior cusp in the vicinity of the magnetopause made by Interball-Tail satellite for the cases of steady southward and variable (mostly northward) interplanetary magnetic field (IMF). Three-dimensional ion distribution functions measured in this region reveal the features predicted by the existing reconnection models. Under southward IMF, three types of ion distribution functions observed in magnetospheric parts of magnetic field lines (torus-like, pancake and D-shaped with a cutoff near zero velocity parallel to the magnetic field) display a gradually decreasing ion entry along "old" reconnected magnetic field lines. Under northward IMF, D-shaped distributions with varying cutoff velocity parallel to the magnetic field are observed. Such distributions are typical for particles injected along recently reconnected magnetic field lines (similar to distributions observed in the boundary cusp). The study of plasma behavior shows that for both cases the entry of magnetosheath plasma into the magnetosphere can be described in terms of reconnection and open topology of field lines near the high-altitude cusp.

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