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Detailed Reference Information |
Fesen, C.G., Richmond, A.D. and Roble, R.G. (1991). Auroral effects on midlatitude semidiurnal tides. Geophysical Research Letters 18: doi: 10.1029/90GL02586. issn: 0094-8276. |
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The effect of auroral activity on mid-latitude semidiurnal tides was investigated using simulations from the NCAR Thermosphere/Ionosphere General Circulation Model (TIGCM). Model runs were made for solar cycle minimum equinox conditions for four levels of geomagnetic activity parameterized by the total hemispheric power index and the cross polar cap potential drop. Simulations at 42.5 ¿N (gg) predicted that the upper thermosphere semidiurnal winds and temperatures generally increase with increasing geomagnetic activity, while the lower thermosphere fields were relatively insensitive to the level of auroral forcing in the model. The modelled semidiurnal mid-latitude tidal response was determined by the magnitude and phasing of the waves generated by in situ solar forcing and the auroral momentum and energy sources, in conjunction with those propagating up from the lower atmosphere. The predicted sensitivity of the model tides to the level of geomagnetic activity may contribute to the observed tidal variability at mid latitudes. Successful modelling of observations will require careful specification of the high-latitude energy and momentum sources. ¿ American Geophysical Union 1991 |
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Abstract |
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Keywords
Meteorology and Atmospheric Dynamics, Waves and tides, Meteorology and Atmospheric Dynamics, Thermospheric dynamics, Atmospheric Composition and Structure, Airglow and aurora, Magnetospheric Physics, Auroral phenomena |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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