Physics
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.3158l&link_type=abstract
Journal of Geophysical Research, vol. 88, Apr. 1, 1983, p. 3158-3168.
Physics
43
Atmospheric Circulation, Dynamic Response, Geostrophic Wind, Polar Regions, Thermosphere, Atmospheric Heating, Coriolis Effect, E Region, F Region, Rossby Regimes, Wind Measurement
Scientific paper
The theory of geostrophic adjustment in which the adjustment process is critically dependent on the ratio of the scale size of the forcing to the Rossby radius of deformation, is applied to the qualitative explanation of certain features of the response of the high latitude thermosphere to inputs of energy and momentum. When the ratio is small, large wind speeds are efficiently generated by a momentum source, and when small, changes in the mass field associated with a heat source are more effectively produced. The Rossby radius variation with height explains the qualitatively different responses of the high latitude E and F regions during disturbed geomagnetic conditions as shown by both observations and numerical models. The present analytic solutions are in good agreement with model results concerning energy apportionment between divergent and rotational components of the wind field as a function of wavenumber.
Larsen Mark F.
Mikkelsen Ib Steen
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