Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9719489w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A12, p. 19,489-19,499.
Physics
23
Atmospheric Circulation, Auroral Arcs, Electric Field Strength, Neutral Atmospheres, Zonal Flow (Meteorology), Ionospheric Conductivity, Ionospheric Ion Density, Resistance Heating, Two Dimensional Models
Scientific paper
The effects of asymmetric potential distributions, arc-neutral feedback, and cross-arc winds on the neutral circulation near auroral arc were examined using a sophisticated two-dimensional high-resolution model of the neutral atmosphere which was preconditioned by allowing weak diffuse aurora to exist prior to the formation of an arc. Simulations were performed with asymmetric potential structures and with an initial state which was warmed and accelerated due to a preexisting diffuse aurora, as well as with arc-zonal wind feedback and with large-scale cross-arc flow. It is shown that, with a preexisting zonal flow and asymmetrical arc structures, strong zonal winds are generated within the arc. Simulations with the arc-zonal feedback indicate that the effect of feedback is not large because of the limited duration of an arc. Simulations with a strong large-scale cross-arc wind indicate that the zonal wind is not strongly sensitive to the large-scale wind.
Lyons Larry R.
Walterscheid Richard L.
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