Physics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.5656d&link_type=abstract
Journal of Geophysical Research, vol. 86, July 1, 1981, p. 5656-5664.
Physics
44
Electric Fields, Field Aligned Currents, Interplanetary Magnetic Fields, Ionospheric Currents, Satellite Observation, Convection, Current Sheets, Daytime, Explorer 12 Satellite, Lines Of Force, Trapped Particles
Scientific paper
A set of simultaneous measurements of the convective electric field and the transverse magnetic field deflections are analyzed. The magnetic field data were taken by instrumentation during 13 passes of the S3-2 satellite through the region of the dayside cusp in both the Northern and Southern Hemisphere. Particular attention is given to the characteristics of the field-aligned currents lying poleward of region 1, and the relationship to the direction of the IMF. Available measurements from the energetic proton detector are used to determine the approximate position of a boundary between quasi-trapped and untrapped 100-keV protons as a qualitative estimator of the open-closed field line boundary. The component of the convection electric field along the satellite trajectory shows that convection reversals occur within two to three degrees equatorward of the boundary between the extra current sheet and the region 1 field-alignment current sheet. The relative location for the region of open magnetic field lines was established and a boundary marking the transition from quasi-trapped to untrapped 100-keV protons was determined.
Burke William J.
Doyle M. A.
Rich Frederic J.
Smiddy Michael
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