Observations of the flow of H(+) and He(+) along magnetic field lines in the plasmasphere

Details Observations of the flow of H(+) and He(+) along magnetic field lines in the plasmasphere Observations of the flow of H(+) and He(+) along magnetic field lines in the plasmasphere

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.8847c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Aug. 1, 1986, p. 8847-8860.

Physics

21

Helium Ions, Hydrogen Ions, Magnetic Flux, Plasma Dynamics, Plasmasphere, Convection, Corotation, Electric Fields, Field Aligned Currents, Mass Spectrometers, Pitch (Inclination), Pressure Gradients

Scientific paper

Based on Retarding Ion Mass Spectrometer data from Dynamics Explorer 1 collected from October 1981 through January 1982, the field-aligned flow of H(+) and He(+) are studied, representing the first direct observation of ion velocities along magnetic field lines at high altitudes of ion velocities along magnetic field lines at high altitudes in the plasmasphere. Downward directed velocities noted in the Northern Hemisphere within 30 deg of the equatorial plane are thought to be interhemispheric flows, and typical velocities are of the order of a few hundred meters per second. Flows of up to 1 km/s in the outer plasmasphere may be associated with refilling, and a summer-to-winter or spring-to-autumn pattern was seen in the flow of both ions, except in the cases of counterstreaming in which He(+) was moving from winter to summer. Counterstreaming in the autumn and winter hemispheres was observed with He(+) flowing upward and H(+) flowing downward.

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