Local transverse ion energization in and near the polar cusp

Details Local transverse ion energization in and near the polar cusp Local transverse ion energization in and near the polar cusp

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..107a&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, Jan. 1988, p. 107-110. Research supported by the Swedish Board for Space

Physics

55

Daytime, Earth Magnetosphere, Magnetospheric Ion Density, Polar Cusps, Electrostatics, Gyrofrequency, Magnetosheath, Polar Orbits

Scientific paper

Ion conics are often observed in the dayside polar cusp region of the magnetosphere by the polar orbiting Viking satellite. These ion distributions may be locally heated perpendicularly to the ambient magnetic field to temperatures of about 100 eV. The conics are closely associated with increased electron fluxes but may occur equatorward of the region of ions injected from the magnetosheath. They are also closely related to waves with frequencies up to about 100 Hz. The wave electric field is directed mainly perpendicular to the ambient magnetic field and shows no clear structure near the ion gyrofrequencies or their harmonics. Observations of ionic conics at 90-deg pitch angle and the related waves indicate that the waves may cause significant ion heating, especially of heavy ions.

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