Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa21c..01c&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SA21C-01
Physics
0310 Airglow And Aurora, 0358 Thermosphere: Energy Deposition, 1704 Atmospheric Sciences, 2407 Auroral Ionosphere (2704)
Scientific paper
The first attempts in the early 1960s, to compute thermospheric neutral winds were based on the existence of a global pressure pattern revealed by satellite drag observations. These early simulations did not include a high-latitude energy source. Later attempts in the 1970s and 1980s to compute the winds based on the energy budget of the thermosphere required the introduction of a heat and momentum source due to auroral processes. Models of auroral particle precipitation and plasma convection needed to calculate the energy inputs were developed in the 1980s. These models were based on averaging large data sets and the resulting patterns were forced to be smooth. The variability associated with the derived patterns of plasma convection was neglected. A ``missing energy'' puzzle developed as factors of 2 and 3 were needed for the Joule Heating calculations in global circulation models, in order to generate the observed wind and temperature structure. Small scale variability in the high-latitude ion convection pattern has been proposed in the 1990s as an additional source of Joule heating and has been shown capable to supply the missing energy. This paper will review the history and the status of high-latitude small-scale variability associated with the plasma convection pattern and its importance for the energy balance of the thermosphere-ionosphere system.
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