Zonally averaged dynamical and compositional response of the thermosphere to auroral activity during September 18-24, 1984

Details Zonally averaged dynamical and compositional response of the thermosphere to auroral activity during September 18-24, 1984 Zonally averaged dynamical and compositional response of the thermosphere to auroral activity during September 18-24, 1984

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9416869m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Dec. 1, 1989, p. 16869-16883.

Physics

45

Atmospheric Models, Atmospheric Temperature, Auroras, Radiant Cooling, Thermosphere, Computerized Simulation, Polar Regions, Spatial Distribution, Temperature Distribution, Time Dependence

Scientific paper

A numerical experiment has been performed to simulate the response of the thermosphere to changes in the high-latitude energy input for September 18-24, 1984. Global distribution of the simulated temperatures above 200 km height varied by up to 1000 K with auroral activity. The auroral processes had a small effect on temperatures below 150 km. Enhancements in NO radiative cooling during the disturbances damped the temperature increases and greatly shortened the temperature relaxation time. The equatorward wind and the associated upward wind was excited promptly in response to the enhancement of the high-latitude energy input. The vertical wind was excited by the thermal expansion of the atmosphere during the initial phase of the auroral disturbances. Without the enhanced NO cooling, the recovery of the composition change after the auroral activity was very slow due to the slow temperature recovery.

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