Physics
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9813645f&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A8, p. 13,645-13,652.
Physics
62
Annual Variations, Diurnal Variations, F Region, Plasma Drift, Solar Activity Effects, Incoherent Scatter Radar, Plasma Density, Polar Regions, Solar Cycles
Scientific paper
Characteristics of low-latitude F region plasma drifts are determined on the basis of Arecibo incoherent scatter measurements from 1981 to 1990. The measurements show large day-to-day variability even during magnetically quiet periods. The average poleward/perpendicular plasma drifts do not change significantly with season and solar cycle except in the midnight-morning sector. The zonal drifts show clear solar cycle and seasonal effects. The plasma drifts along the magnetic field lines exhibit large altitudinal and seasonal variations, particularly near solar minimum, and are generally anticorrelated with the perpendicular/north drifts. The drift patterns observed by the Arecibo and the middle and upper atmosphere radars have significantly different seasonal dependences. This is explained by electrodynamic effects in the corresponding local and conjugate ionospheres.
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