Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsa41b..08r&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SA41B-08
Physics
2407 Auroral Ionosphere (2704), 2427 Ionosphere/Atmosphere Interactions (0335), 2431 Ionosphere/Magnetosphere Interactions (2736), 2447 Modeling And Forecasting, 2721 Field-Aligned Currents And Current Systems (2409)
Scientific paper
The net upward transport of thermospheric molecular species (N2 and O2) by high-latitude Joule heating is evaluated with a two-dimensional, time-dependent model of thermospheric dynamics. The net transport through a constant-pressure surface depends on the spatial structure of the heating. Heating that is spatially concentrated produces greater net upward transport of molecular species than does the same amount of heat deposited over a broader area. The net transport is also affected by the duration of the heating for a given air parcel, which depends both on the heating duration at a given location, and on the length of time the air parcel remains at that location before being advected away by large-scale winds. We use results from analyzing the characteristic spatial scales of intense Joule heatingst , derived from electric- and magnetic-field measurements on the Dynamics Explorer-2 spacecraft, and include them in the numerical model. We show that the net upward transport by small-scale heating structures can be simulated by an effective eddy diffusivity that depends on the heating intensity. Parametrizing the effects of intense heating on the mixing is important for global circulation models, which cannot resolve these small spatial scales explicitly.
Maute A. I.
Richmond Arthur D.
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