Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jastp..70.2374p&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 70, Issue 18, p. 2374-2380.
Physics
2
Polar Upper Atmosphere, Cleft/Cusp Region, Ionospheric Perturbation, Thermospheric Perturbation
Scientific paper
In the dayside polar region--loosely referred to as the cleft region--particle precipitation and Joule heating cause significant perturbations of the upper atmosphere. Here Dynamics Explorer-2 satellite data are used to present a synopsis of these disturbance effects. Documented are an increase in electron temperature and a decrease in electron density; increases in ion drift speed and ion temperature; an increase in the upward-directed ion velocity; increases in zonal wind speed and neutral gas temperature; and changes in the neutral gas composition and mass density. It is suggested that the increase in electron temperature is partly controlled by the decrease in electron density; that the ion upflow velocity mainly depends on the electron temperature, less frequently on the ion temperature; and that the observed decrease in thermospheric mass density is due to a decrease in the atomic oxygen density, which in turn is caused by diverging wind flows.
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