Properties of spikelike shear flow reversals observed in the auroral plasma by Atmosphere Explorer C

Details Properties of spikelike shear flow reversals observed in the auroral plasma by Atmosphere Explorer C Properties of spikelike shear flow reversals observed in the auroral plasma by Atmosphere Explorer C

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.3886b&link_type=abstract

Journal of Geophysical Research, vol. 81, Aug. 1, 1976, p. 3886-3896.

Physics

9

Convective Flow, Ionospheric Drift, Reversed Flow, Shear Flow, Electric Fields, Electron Precipitation, Explorer 51 Satellite, Field Aligned Currents, Ionospheric Currents, Night Sky, Satellite Observation

Scientific paper

A study of the characteristics of pairs of oppositely directed spikes in ionospheric convection velocities (or shear flow reversals), as first described by Gurnett, has been conducted by using data from Atmosphere Explorer C. These phenomena tend to occur near the large-scale reversal from sunward to antisunward convection on the nightside of the earth. Generally, the spikelike shear flow reversals involve electric field components along the spacecraft orbit that are directed toward the region between them, in which inverted V type electron precipitation is observed. This relationship between the electron precipitation and the electric field spikes is consistent with an upward-flowing field-aligned current that is fed by Pedersen currents from the adjacent regions of strong convection. In one case a divergent equivalent electric field structure was observed, that is, with the spikelike electric fields pointing away from the region in between, which in this case exhibited a sharp electron flux dropout. This opposite configuration may be an example of counterparts to inverted V structures existing in regions of downward-flowing field-aligned currents.

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