Incoherent scatter observations of tides in the lower thermosphere at high latitudes

Details Incoherent scatter observations of tides in the lower thermosphere at high latitudes Incoherent scatter observations of tides in the lower thermosphere at high latitudes

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992adspr..12...97w&link_type=abstract

(The earth's middle and upper atmosphere; Proceedings of the Topical Meeting of the Interdisciplinary Scientific Commission C /M

Computer Science

1

Atmospheric Tides, Eiscat Radar System (Europe), Incoherent Scatter Radar, Polar Regions, Radar Measurement, Thermosphere, Atmospheric Temperature, Auroras, Field Aligned Currents, Ion Temperature, Mesosphere, Planetary Waves

Scientific paper

Incoherent scatter measurements at high latitudes show that in the height range between 100 and 130 km the velocity of the neutral atmosphere shows a prominent sinusoidal component with a 12-hour period. The variation of phase with height for this component is approximately constant from day to day, and corresponds to the predicted variation for the (2, 4) mode of the global tide; at greater heights, the variation of phase with height is much slower and corresponds to the (2, 2) mode. The amplitude of this semidiurnal mode as measured at EISCAT shows a deep modulation with a period of about 53 hours, and this is interpreted as the result of a nonlinear interaction in the mesosphere between the semidiurnal tide and the most prominent planetary wave at these latitudes. A diurnal mode is also observed which shows even greater day-to-day variability. There is good qualitative agreement between the measurements made at EISCAT, chatanika and Sondrestrom, especially for the semidiurnal component. There is also reasonable agreement with the predictions made using the various models of the lower thermosphere, but the effect of ion-drag driven by magnetospheric convection is difficult to model in detail. Tidal modes are also observed in the semidiurnal variation of ion temperature.

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