Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa23b..02d&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA23B-02
Physics
0358 Thermosphere: Energy Deposition (3369), 2411 Electric Fields (2712), 2427 Ionosphere/Atmosphere Interactions (0335), 2431 Ionosphere/Magnetosphere Interactions (2736)
Scientific paper
Analyzing DE-2 satellite data and fitting the data to analytic functions of the independent variables, a new quantitative empirical model of the high-latitude forcing of the thermosphere has been developed, including electric potential, magnetic potential and Poynting flux. Coupling this empirical model with NCAR-TIEGCM, the influence of the high-latitude energy inputs and energy distributions on the global thermospheric temperature, density, and composition has been investigated. First, the Joule heating calculated with the average electric field, which is called ¡°simple Joule heating¡±, is compared with the Poynting flux from the empirical model to show the contribution of electric and magnetic field variability to the Joule heating. Secondly, an inter-comparison among three different methods to distribute the Poynting flux in altitude has been conducted. The difference of the thermosphere response suggests that not only the total amount of energy input, but the way to distribute the energy are significant for the impact of the magnetosphere on the thermosphere and ionosphere.
Deng Youjin
Maute Astrid
Richmond Arthur D.
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