Tidal oscillations in the thermosphere: a theoretical investigation of their sources

Details Tidal oscillations in the thermosphere: a theoretical investigation of their sources Tidal oscillations in the thermosphere: a theoretical investigation of their sources

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jastp..63..899m&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 63, Issue 9, p. 899-914.

Physics

12

Scientific paper

Measurements of tidal oscillations in the mid to high latitude thermosphere reveal a dependency of diurnal and semidiurnal wind amplitudes on geomagnetic activity. This cannot be explained on the basis of the classical assumption that tides in the lower thermosphere originate primarily from below the mesopause. We use an updated version of the Coupled Thermosphere-Ionosphere-Plasmasphere model (CTIP) to numerically simulate the thermospheric wind oscillations, distinguishing between those propagating upwards through the mesopause and those generated in situ. These simulations suggest that in situ diurnal and semidiurnal oscillations generated at mid to high latitudes by ion-neutral interactions such as ion drag and Joule heating are comparable in magnitude and, towards higher latitudes, stronger than the upwards propagating tides with which they interact through both destructive and constructive interference. Due to their geomagnetic origin, the in-situ oscillations strongly depend on Kp and thus cause an overall Kp dependency in the observed diurnal and semidiurnal winds. We predict the occurrence of measurable in-situ tides also for mid-latitude sites with higher geomagnetic latitude, such as Millstone Hill, during geomagnetically disturbed conditions.

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