Mathematics – Logic
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa21b0090v&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SA21B-0090
Mathematics
Logic
2415 Equatorial Ionosphere, 2467 Plasma Temperature And Density, 2481 Topside Ionosphere
Scientific paper
The fundamental properties of the topside ionosphere are dependent on the low altitude F region plasma and neutral dynamics. Variations in solar activity can cause pressure gradients to drive neutral winds in the F region. These winds blowing from one hemisphere to another can raise the F peak in one hemisphere and lower it in the other hemisphere. This leads to field aligned motion of plasma in turn affecting composition and temperature in the topside. In this study, data are obtained from the Defense Meteorological Satellite Program (DMSP) satellites for varying levels of solar activity. Variations driven by solar activity within a month (for e.g. during equinox) and for the same months, the average F10.7 level is representative of the sunspot cycle. The aim here is to understand solar activity influences on the topside over periods ranging from many years (for e.g. fraction of a solar cycle) to a few months. During solstices, solar activity will additionally drive variations in E x B drifts and neutral winds responsible for changing the behavior in the topside. The extent to which these variations are seen over a period of a few months versus period of a few years (for e.g. fraction of a solar cycle) will be also investigated by examining daytime and nighttime passes.
Heelis Rod
Venkatraman Sarita
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