Spatial extent of the plasma injection region in the cusp-magnetosheath interface

Details Spatial extent of the plasma injection region in the cusp-magnetosheath interface Spatial extent of the plasma injection region in the cusp-magnetosheath interface

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93..105m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Jan. 1, 1988, p. 105-113.

Physics

52

Electron Plasma, Ion Injection, Magnetic Signatures, Magnetosheath, Polar Cusps, Solar Wind, Energy Dissipation, Interplanetary Magnetic Fields, Ion Temperature

Scientific paper

Using data from the high-altitude plasma instrument onboard the DE 1 spacecraft, the perpendicular (to the magnetic field) extent of the region of ion injection into the cusp has been estimated by measuring the energy dispersion of the ion V-shaped signatures seen on energy-time spectrograms. Three different passes were chosen based on the clarity of the V-shaped ion signatures. These studies indicate that the injection region has a dimension perpendicular to the magnetic field in the range D = 1000-6000 km at a radial distance of about 10 earth radii, in good agreement with reported diameters of flux transfer events (FTEs). Similar measurement of the energy dispersion of an electron V-shaped signature observed on one pass has yielded a parallel extent of the plasma injection region in the range D(parallel) = 100-350 km. The results lead to the suggestion that the plasma within an FTE travels down the field line as the field line convects antisunward, and may subsequently be observed in the polar cusp as a V-shaped signature.

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