Thermospheric Mixing by Intense Small-Scale Joule Heating

Details Thermospheric Mixing by Intense Small-Scale Joule Heating Thermospheric Mixing by Intense Small-Scale Joule Heating

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa21b1543r&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA21B-1543

Physics

0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition (3369), 2407 Auroral Ionosphere (2704), 2427 Ionosphere/Atmosphere Interactions (0335), 3369 Thermospheric Dynamics (0358)

Scientific paper

Intense small-scale Joule heating structures can induce mixing of thermospheric constituents, which may significantly supplement the mixing caused by the global-scale meridional circulation driven by the total Joule heating. Associated with the net upward flux of molecular nitrogen and oxygen due to the small-scale mixing is an additional upward heat flux. The relative importance of small-scale mixing, as compared with the importance of mixing by the meridional circulation, likely increases with magnetic activity. A parametrization is presented in terms of an effective eddy diffusivity. For a moderately active level of Joule heating, the effective eddy diffusivity may be a sizable fraction of molecular diffusivity between 120~km and 250~km altitude at auroral latitudes.

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