Variability of winds and temperatures in the lower thermosphere |
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| Institution: | 1. Laboratório de Física e Astronomia, Universidade do Vale do Paraíba (UNIVAP), Av. Shishima Hifumi, 2911, Urbanova, São José Dos Campos, SP, Brazil;2. National Atmospheric Research Laboratory (NARL), Gadanki, India;3. Indian Institute of Geomagnetism, New Panvel, Navi Mumbai, India;1. University of Houston, 4800 Calhoun Rd, Houston, TX 77204, USA;2. KBR, 601 Jefferson Street, Houston, TX 77002, USA;3. NASA Johnson Space Center, 2101 E NASA Pkwy, Houston, TX 77058, USA;4. NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771, USA;5. Department of Astronomy, University of Maryland, 4296 Stadium Dr., College Park, MD 20742, USA;6. Leidos, Inc., 555 Forge River Rd, Ste 150A, Webster, TX 77598, USA;7. NASA Ames Research Center, Mail Stop 204-14 Moffett Field, CA 94035, USA;8. Georgia State University, 25 Park Place NE, Atlanta, GA 30303, USA;9. CIRES, University of Colorado Boulder, 216 UCB, Boulder, CO 80309, USA;10. 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| Abstract: | High-resolution daytime incoherent scatter radar measurements of plasma temperatures and drifts in the ionospheric E-region above Millstone Hill (42.6°N, 71.5°W) have been used to derive horizontal neutral winds and temperatures in the lower thermosphere (105–130 km) during five multi-day campaigns in 1987–1991. The underlying semi-diurnal tidal component has been determined from the observations, with characteristic average amplitudes of 50 ± 15 m/s and 30 ± 10 K. Phase propagation with altitude follows the expected structure of semi-diurnal tidal modes, but reveals complex coupling of tidal modes, particularly above 115 km. Day-to-day variability in the winds and temperatures is large, and the deviations from the semi-diurnal harmonic can exceed 40 m/s and 50 K. No strong correlations have so far been found with geophysical parameters to explain the observed variability. |
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