Heat budget of the thermosphere and temperature variations during the recovery phase of a geomagnetic storm

Details Heat budget of the thermosphere and temperature variations during the recovery phase of a geomagnetic storm Heat budget of the thermosphere and temperature variations during the recovery phase of a geomagnetic storm

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9714947m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A10, p. 14,947-14,957.

Physics

10

Atmospheric Heat Budget, Atmospheric Temperature, Magnetic Storms, Relaxation Time, Thermosphere, Variations, Atmospheric Models, Thermodynamic Coupling, Two Dimensional Models

Scientific paper

A 2D model of coupled dynamics and composition is employed to characterize the thermospheric heat budget and temperature changes following geomagnetic storms. Temperature relaxation is examined as a function of latitude and pressure, and a term analysis of the energy conservation equation is used as the basis for describing the temperature-recovery process. A time constant is derived from the heat balance between the heating/cooling rates to describe temperature variation as a function of time. The temperature relaxation time is found to be longer at high latitudes and is typically 12-15 hrs and 15-21 hrs in the upper and lower regions of the thermosphere, respectively. Downward molecular heat conduction is the important cooling mechanism in the upper thermosphere, whereas significant radiative cooling from the 5.3-micron NO band occurs in the lower altitude regions. The recovery phase of geomagnetic storms is influenced to some degree by global dynamical and thermal coupling in the thermosphere.

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