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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Atmospheric Tides and Planetary Waves in the MLT and their Role in the Atmosphere- Ionosphere Coupling Pancheva Dora , Mukhtarov Plamen Geophysical Institute With the recent accumulation of the satellite ionospheric measurements some attention is now being directed towards investigating the impact of wave forcing from the lower atmosphere. Recently when the level of solar activity is very low and when there is not a flare or geomagnetic storm in progress it is particularly appropriate for investigating the vertical coupling of the atmosphere-ionosphere system by atmospheric tides and planetary waves. The six-satellite Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) mission makes routine ionospheric measurements over the entire globe using occultation techniques. These observations have been used in to develop global-scale maps of the electron density for altitudes between 100 km and 800 km and for the period of time between January 2008 and March 2009. The temperature measurements from the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument on the Thermosphere-Ionosphere-Mesosphere-Energetics and Dynamics (TIMED) satellite have been analyzed in order to derive the global spatial structure and temporal variability of the atmospheric tides (migrating and nonmigrating) and planetary waves (stationary and zonally propagating) from the lower stratosphere to the lower thermosphere (20-120 km). For a given altitude and latitude the COSMIC electron density is analyzed in the same way as that used for the SABER temperatures. In this way it is possible to extract ionospheric disturbances with a given period and zonal structure. The presentation will be focused mainly to the global distribution and temporal variability of the ionospheric response to the eastward propagating diurnal tides with zonal wavenumbers 2 and 3.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Superposition Effects in the Mesosphere and Lower Thermosphere Associated with Tides Pancheva Dora , Mukhtarov Plamen Geophysical Institute Atmospheric tides often constitute the dominant dynamical component of the mesosphere and lower thermosphere (MLT). Tides observed in neutral wind or temperature in the MLT are measured from the ground using different type of radars and lidars, providing excellent temporal and vertical resolution of the tidal fields. A major disadvantage of ground-based methods is their inability to distinguish between global and local signatures hence the measured tides are superposition of all migrating and nonmigrating tides for a given geographical point. Satellite-borne remote sensing instruments however afford the opportunity to measure the global distribution of the tidal fields, i.e. to separate and determine the migrating and nonmigrating tidal components. The measurements from the SABER instrument on the TIMED satellite have provided global temperature data from the lower stratosphere to the lower thermosphere since 2002. The continuous temperature data for 6 full years (2002-2007) and for altitudes between 20-120 km and latitude between 50 o N-50 o S are used in order to obtain the climatological features of the diurnal and semidiurnal tides with zonal wavenumbers up to 4. The effects originated from the superposition of diurnal and semidiurnal tides are demonstrated particularly for a geographical point (40 o N, 105 o W). A detailed comparison between the climatological features of the diurnal and semidiurnal tides seen in the SABER/TIMED temperatures at a point (40 o N, 105 o W)and the Na lidar observations over Fort Collins, Colorado (41 o N, 105 o W) will be presented.
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