AE-C observations of low-energy particles and ionospheric temperatures in the turbulent polar cusp - Evidence for the Kelvin-Helmholtz instability

Details AE-C observations of low-energy particles and ionospheric temperatures in the turbulent polar cusp - Evidence for the Kelvin-Helmholtz instability AE-C observations of low-energy particles and ionospheric temperatures in the turbulent polar cusp - Evidence for the Kelvin-Helmholtz instability

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.3877p&link_type=abstract

Journal of Geophysical Research, vol. 83, Aug. 1, 1978, p. 3877-3882.

Physics

10

Electron Energy, Explorer 51 Satellite, Ionospheric Temperature, Kelvin-Helmholtz Instability, Magnetic Storms, Photoelectron Spectroscopy, Polar Cusps, Polar Regions, Electrostatic Probes, Energy Spectra, Field Aligned Currents, High Energy Electrons, Ionospheric Electron Density, Ionospherics, Magnetic Fields, Plasma Waves, Satellite-Borne Instruments

Scientific paper

Particle observations at 283 km acquired with the AE-C spacecraft during the large geomagnetic storm of May 16, 1975 indicate that the polar cusp was displaced to 71 deg invariant latitude between 1020 and 1244 MLT. Three regions of low-energy particle fluxes were determined which may be indentified with regions of field-aligned current flow in the dayside auroral zone and cusp. It is suggested that the low-energy electrons are scattered and that their pitch angles are isotropized by magnetic fluctuations associated with the Kelvin-Helmholtz instability caused by shear in the proton flow into the cusp.

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