Field-aligned drifts in subauroral ion drift events

Details Field-aligned drifts in subauroral ion drift events Field-aligned drifts in subauroral ion drift events

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9821493h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A12, p. 21,493-21,499

Physics

25

Auroral Zones, Drift Rate, F Region, Field Aligned Currents, Ion Motion, Ionospheric Drift, Plasma Drift, Mathematical Models, Plasma Dynamics, Plasma Heating

Scientific paper

Calculations of the response of F region plasma to rapid subauroral ion drifts (SAID) show that the maximum field-aligned drift is a strong function of the time scale over which the SAID is applied. For SAID velocities of 2 km/s the peak field-aligned drifts can vary by almost a factor of 10 for differences in the onset time scale from a few seconds to a few minutes. Reasonable considerations of the convective configurations in a SAID event suggest that acceleration times between 10 and 20 min might typically be expected. In such cases, much smaller field-aligned velocities should be observed than would be predicted assuming an essentially instantaneous turn on of the SAID event.

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