High-latitude troughs and the polar cap boundary

Details High-latitude troughs and the polar cap boundary High-latitude troughs and the polar cap boundary

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81..690g&link_type=abstract

Journal of Geophysical Research, vol. 81, Feb. 1, 1976, p. 690-694.

Physics

Ionospheric Ion Density, Plasma Density, Polar Caps, Thermal Plasmas, Upper Atmosphere, Electric Fields, Electron Energy, Helium Ions, Hydrogen Ions, Mass Spectrometers, Molecular Ions, Nitric Oxide, Ogo-6, Trapped Particles, Troughs

Scientific paper

OGO 6 observations of troughs in the thermal plasma densities in the topside ionosphere are discussed. Ion mass spectrometer measurements were correlated with energetic electron detector and electric field measurements. It is shown that the variation of ion composition at high latitudes is complex and frequently characterized by mid-latitude and high-latitude density depression. Prominent high-latitude troughs in the atomic ion (H, He, O) distributions were seen to lie frequently near the polar cap boundary. This indicates that these troughs are unrelated to the plasmapause which is found on closed magnetic field lines away from the trapping boundary. The production of the high-latitude troughs is shown to be related to enhancements in the soft electron flux and/or to the convection electric field.

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