Effects of electrical coupling on equatorial ionospheric plasma motions - When is the F region a dominant driver in the low-latitude dynamo?

Details Effects of electrical coupling on equatorial ionospheric plasma motions - When is the F region a dominant driver in the low-latitude dynamo? Effects of electrical coupling on equatorial ionospheric plasma motions - When is the F region a dominant driver in the low-latitude dynamo?

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.6033c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A4, p. 6033-6037.

Physics

44

Atmospheric Electricity, Dynamo Theory, Earth Ionosphere, F Region, Plasma Dynamics, Space Plasmas, E Region, Equinoxes, Zonal Flow (Meteorology)

Scientific paper

By computing field line integrals of the Hall and Pedersen conductivities and wind-driven currents from a sophisticated F region model, we find that the F region may provide a significant contribution to the dynamo electric field at all local times in a limited altitude and latitude region. The field line integrated Pedersen conductivity of the F region can be significantly larger than the integrated Pedersen conductivity of the E region. This effect is most pronounced for low-latitude flux tubes with apex altitudes slightly above the F peak. This is due to the unique geometry of the equatorial geomagnetic field in which the field line path length through the F region is much greater than the field line path length through the E region. This effect decreases with increasing latitude as the field lines become more vertical and the path lengths through the appropriate pans of E and F regions become more comparable. We examine the impact of this effect on low-latitude drifts derived from three dynamo circuit assumptions, and compare the results to average drifts observed at Jicamarca, Peru.

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