Field line equipotentiality and ion neutral collision frequencies in the dynamo region deduced from Saint-Santin ion drift measurements

Details Field line equipotentiality and ion neutral collision frequencies in the dynamo region deduced from Saint-Santin ion drift measurements Field line equipotentiality and ion neutral collision frequencies in the dynamo region deduced from Saint-Santin ion drift measurements

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.6843t&link_type=abstract

Journal of Geophysical Research, vol. 86, Aug. 1, 1981, p. 6843-6852.

Physics

1

Dynamo Theory, Ionic Collisions, Ionospheric Drift, Radar Measurement, E Region, Electric Fields, Electrodynamics, Equipotentials, Gyrofrequency, Incoherence, Ionospheric Ion Density, Lines Of Force, Magnetic Field Configurations, Radar Scattering

Scientific paper

The theoretical description of ion transport in the ionospheric dynamo layer is experimentally tested, and electric fields and ion neutral collision frequencies are deduced from the observed drifts, through an analysis of three-dimensional ion drift data from the Saint-Martin incoherent scatter facility. Using a geometrical representation of the ion momentum equation, it is shown for the case of the middle latitudes that, because horizontal neutral wind influences ion motions both parallel and orthogonally to the field lines in the ionospheric dynamo layer, three-dimensional ion drift measurement data is redundant; permitting the standard theoretical description of ionospheric electrodynamics to be checked in two ways. Daily median values of the ion collision frequencies thus obtained are found to compare reasonably well with those derived from the Jacchia neutral atmosphere model for the case of the equinox sample.

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