On the mechanisms responsible for high-latitude thermospheric composition variations during the recovery phase of a geomagnetic storm

Details On the mechanisms responsible for high-latitude thermospheric composition variations during the recovery phase of a geomagnetic storm On the mechanisms responsible for high-latitude thermospheric composition variations during the recovery phase of a geomagnetic storm

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9416961b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Dec. 1, 1989, p. 16961-16968.

Physics

27

Atmospheric Composition, Atmospheric General Circulation Models, Magnetic Storms, Polar Regions, Thermosphere, Continuity Equation, Equinoxes, Ionospheric Electron Density, Nitrogen, Radiant Cooling, Recovery, Vertical Air Currents

Scientific paper

The causal mechanisms for the recovery of the perturbed high-latitude thermospheric composition to the unperturbed state in the period following a geomagnetic storm are investigated. Model runs of the NCAR thermosphere/ionosphere GCM (TIGCM) and thermosphere GCM are used to calculate the averaged mass mixing ratio variations and the forcing terms responsible for these variations during the recovery phase of a geomagnetic storm. High latitude compositional recovery is found to occur in the NCAR TIGCM on a time scale of about 12 hr to 1 day. This time scale is in agreement with previously observed time scales for typical poststorm F region electron density recoveries. Neither molecular diffusion nor large-scale horizontal advection is the dominant process in determining the compositional state during the recovery period. Thermospheric compositional recovery at high geomagnetic latitudes is driven primarily by vertical advection.

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