Anomalous resistivity on auroral field lines

Details Anomalous resistivity on auroral field lines Anomalous resistivity on auroral field lines

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8.1257r&link_type=abstract

Geophysical Research Letters, vol. 8, Dec. 1981, p. 1257-1260. Navy-supported research

Physics

29

Atmospheric Electricity, Auroral Zones, Electrical Resistivity, Electron Acceleration, Electron Distribution, Lines Of Force, Anomalies, Ion Cyclotron Radiation, Plasma Frequencies

Scientific paper

Consideration is given to a possible explanation for the one-dimensional anomalous resistivity and breakdown of runaway acceleration observed in the auroral zones. It is shown that under conditions existing along auroral field lines, where the cyclotron frequency is greater than the plasma frequency and density fluctuations exceed 0.25, trapping of a major portion of the electron distribution function by large-amplitude ion cyclotron waves can inhibit the free acceleration of runaways and act to violate the conservation of the first adiabatic invariant for electrons above a certain threshold velocity. Particle simulations combining the effects of finite ion cavities and pitch angle scattering at the anomalous Doppler resonance are then presented which demonstrate the formation of a runaway distribution upon the application of a constant dc field and the effects of the instability at the anomalous Doppler resonance in preventing it. The necessity for further large-scale macrophysics simulations to gain a fuller understanding of the total system dynamics is pointed out.

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