Reduced dynamical equations for the high-latitude thermosphere: Ion drag balance

Details Reduced dynamical equations for the high-latitude thermosphere: Ion drag balance Reduced dynamical equations for the high-latitude thermosphere: Ion drag balance

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...104.6805k&link_type=abstract

Journal of Geophysical Research, Volume 104, Issue A4, p. 6805-6812

Computer Science

Sound

1

Ionosphere

Scientific paper

Although highly variable on small scales, the middle thermosphere shows evidence of slow-timescale mesoscale dynamics. A reduced set of equations is derived by asymptotic scale analysis. The drag-balance equations describe the nonlinear evolution of the thermosphere during magnetic quiet times under an approximate balance of pressure, Coriolis, and ion-drag forces. The equations explicitly remove gravity and sound oscillations, making them well suited for theoretical study of slow-timescale evolution and efficient for numerical modeling. Linear analysis is used to establish the limits of their validity in terms of timescale separation. The slow-timescale component is only weakly damped for horizontally broad motions, even when the ion-neutral collision frequency is large.

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