An Analysis of Mid-Latitude Neutral Wind in the Lower Thermosphere: Comparison of Fall and Spring Equinoxes

Details An Analysis of Mid-Latitude Neutral Wind in the Lower Thermosphere: Comparison of Fall and Spring Equinoxes An Analysis of Mid-Latitude Neutral Wind in the Lower Thermosphere: Comparison of Fall and Spring Equinoxes

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa41a0270g&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA41A-0270

Physics

3369 Thermospheric Dynamics (0358), 3389 Tides And Planetary Waves, 3394 Instruments And Techniques

Scientific paper

We present an analysis of tidal structures in the altitude range of 100 to 130 km for the September 1-30, 2005 and March 6-April 6, 2006 periods using the winds measured by the Millstone Hill incoherent scatter radar (42.6N, 288.5E). The dominant signal in both zonal and meridional winds is the semidiurnal component, as expected from the tidal theory and previous experimental data. Both zonal and meridional components of semidiurnal tide are stronger during the spring equinox, reaching 70-80 m/s, and have a well defined maximum around 110-118 km. In September, amplitude of 12-h tide peaks at 112km and 60-65 m/s for the meridional component, while the zonal component exceeds 50 m/s in range of altitudes from 105 to 130 km. The diurnal tide, which has often been assumed negligible in earlier observations, is found at altitudes 105-120 km. The phase structure of the diurnal component indicates domination of the in-situ generated tide. A perfect agreement between the data and GSWM02 predictions is found in March in the phase of the semidiurnal tide. Tidal amplitudes are typically underestimated by GSWM02 by a factor of 1.5-2 for semidiurnal component and overestimated for the diurnal component, with better agreement found for the spring equinox. Similarly to GSWM02, TIMEGCM simulations underestimate the amplitude of the 12-h component and overestimate the amplitude of the 24-h component at altitudes below 110 km, with predicted phases of 12-h component lagging observed phases by 2-3 hours.

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