Current-driven plasma instabilities at high latitudes

Details Current-driven plasma instabilities at high latitudes Current-driven plasma instabilities at high latitudes

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.2030s&link_type=abstract

Journal of Geophysical Research, vol. 80, June 1, 1975, p. 2030-2040.

Physics

1

Ionospheric Currents, Magnetospheric Instability, Polar Regions, Satellite Observation, Auroral Zones, Electron Distribution, Field Aligned Currents, Ogo-5, Particle Interactions, Plasma Conductivity, Wave Interaction

Scientific paper

Earlier Ogo 5 discussions of high-latitude magnetospheric wave-particle interaction phenomena associated with field aligned current systems are extended by considering some September 7, 1968, out-bound measurements and corresponding March 11, 1969, observations, when the spacecraft was traversing auroral L shells in midafternoon. It is shown that during moderate magnetospheric disturbances the most intense waves and currents were detected near sharp boundaries in the density of polar cleft electrons, and it is possible that local wave-particle interactions produced anomalous resistivity. Some observed changes in the electron distribution functions might be explained in terms of local acceleration, but significant causal questions about the dynamics remain open if one can use only local data from a single spacecraft in this region.

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