Physics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.6751c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, June 1, 1989, p. 6751-6761.
Physics
52
Dynamics Explorer 2 Satellite, F Region, Magnetohydrodynamic Flow, Plasma Drift, Space Plasmas, Electric Fields, Equatorial Atmosphere, Harmonic Analysis, Ion Motion
Scientific paper
Horizontal and vertical ion drift data from the DE 2 spacecraft have been used to determine average zonal and vertical plasma flow (electric field) characteristics in the +/- 26-deg dip latitude region during a time of high solar activity. The 'average data' local time profile for an apex height bin centered at 400 km indicates westward plasma flow from 0600 to 1900 solar local time ((SLT) with a maximum westward velocity of 80 m/s in the early afternoon. There is a sharp change to eastward flow at approximately 1900 hours with an early evening peak of 170 m/s. A secondary nighttime maximum exists at 0430 SLT preceeding the reversal to westward flow. This profile is in good agreement with Jicamarca, Peru, radar measurements made under similar solar maximum conditions. Haramonic analysis indicates a net superrotation which is strongest at lower apex altitudes. The diurnal term is dominant, but higher order terms through the quatradiurnal are significant.
Coley William R.
Heelis Roderick A.
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