Observations of energetic electron and ion distributions near the magnetopause at geosynchronous orbit and related ground effects

Details Observations of energetic electron and ion distributions near the magnetopause at geosynchronous orbit and related ground effects Observations of energetic electron and ion distributions near the magnetopause at geosynchronous orbit and related ground effects

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.217..137k&link_type=abstract

In ESA Achievements of the Intern. Magnetospheric Study (IMS) p 137-141 (SEE N85-24544 14-46)

Computer Science

Electron Distribution, Geosynchronous Orbits, Ion Distribution, Magnetic Storms, Magnetopause, Geos 2 Satellite, International Magnetospheric Study, Magnetic Signatures, Magnetohydrodynamic Flow, Magnetosheath

Scientific paper

A GEOS-2 crossing of the dayside magnetopause during a geomagnetically disturbed period was selected to show clear signatures of the interconnection of field lines through the magnetopause. Pitch angle distributions of electrons and ions are found to be strongly asymmetric with respect to 90 deg. The asymmetries are interpreted in terms of field-aligned particle streaming. Comparisons of electron spectra provide evidence that the streaming electrons observed in the magnetosheath originate in the magnetosphere. Simultaneous ground observations with radar show regions with an outward flow and an antisunward flow at the poleward border of the field of view. The longitudinal width of these regions are 4 deg in angular extent on radar plots, or 200 km at geostationary orbit. The lifetime of these apparent merging regions is 6 to 12 min.

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