Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa14a..08f&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA14A-08
Physics
2159 Plasma Waves And Turbulence, 2411 Electric Fields (2712), 2435 Ionospheric Disturbances, 3384 Acoustic-Gravity Waves
Scientific paper
We use satellite and ground-based observations to examine the main characteristics of low latitude electrodynamic plasma drifts and their effects on equatorial spread F and low latitude plasma structure during low solar flux periods. The ionospheric plasma drifts have considerably larger temporal and spatial variability near solar minimum than close to solar maximum during both quiet and disturbed geomagnetic conditions. The magnitude and altitudinal structure of the prereversal enhancement of the equatorial upward plasma drift, which plays a fundamental role in the generation and development of equatorial spread F and scintillations, varies strongly with season, longitude, solar flux and geomagnetic activity. The relative importance of evening and nighttime season and possibly longitude dependent prompt penetration and disturbance dynamo vertical plasma drifts also changes significantly with solar flux. In this talk, we first discuss the main challenges for a more detailed understanding of quiet and disturbed equatorial electrodynamic drifts. Then, we briefly examine the potential effects of these drifts on equatorial spread F development. Finally, we discuss the potential of C/NOFS electric field and plasma drift measurements for the understanding of the complex variability of equatorial plasma waves and density structures.
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