Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa51a1126d&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SA51A-1126
Physics
2427 Ionosphere/Atmosphere Interactions (0335), 3367 Theoretical Modeling, 3369 Thermospheric Dynamics (0358)
Scientific paper
Recent satellite observations reveal that a neutral density enhancement of up to a factor of two can occur in the northern dayside cusp region at 400 km altitude. It has been suggested that Joule heating is responsible for the thermospheric upwelling. In order to quantify the magnitude of ionospheric heating necessary to cause the observed neutral density enhancement, we have conducted simulations using a global time-dependent model of the thermosphere together with an idealized heat source in the region of the cusp. In our simulations, we have varied the magnitude of the energy transfer to the thermosphere from the idealized heat source, the duration of the energy transfer, and the extent of the region in which the transfer occurs. We find that the energy transfer from the ionosphere to the thermosphere required to account for the observed neutral upwelling is considerable, on the order of 100 times the normal ion-neutral frictional heating expected at 400 km altitude.
Demars Howard G.
Schunk Robert W.
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