First Simultaneous MLT and Thermospheric F-region Observations

Details First Simultaneous MLT and Thermospheric F-region Observations First Simultaneous MLT and Thermospheric F-region Observations

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa41a1046b&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA41A-1046

Physics

2427 Ionosphere/Atmosphere Interactions (0335), 2437 Ionospheric Dynamics, 2443 Midlatitude Ionosphere, 0355 Thermosphere: Composition And Chemistry

Scientific paper

Earth's thermosphere and the embedded ionosphere, called the thermospheric F region, have been studied in numerous publications. From these studies, it is known that complete understanding of the behavior of the thermospheric F region requires its coupling to the magnetosphere above and the mesosphere lower-thermosphere (MLT) region below. Recently, we have started observing the MLT and thermospheric F regions simultaneously by operating the MU radar (35oN, 136oE) in alternate meteor and incoherent scatter (IS) modes under a project called MTEC-S (Mesosphere Thermosphere Experiments for Coupling Studies), with a view to identify the tides and waves that can dynamically couple the upper atmospheric regions. The MTEC-S observations (each lasting more than a week) provide simultaneous zonal and meridional wind velocities at MLT altitudes (80-95 km), meridional wind velocity in the upper thermosphere (220-450 km), and electron density (150-600 km), peak height and plasma drift velocity in the ionosphere with a time resolution of 1.5 hours. The long data sets, one in each season during 2000-01, and their spectra are used to obtain the mean winds, and tides and waves that can couple the MLT and thermospheric F regions in different seasons. The seasonal and solar activity dependencies of the mean wind velocity and tidal amplitudes (of periods 24 and 12 hours) at the MLT and thermospheric F region altitudes are also presented.

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