scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Solar and cosmic-ray flux variability on different time scales: Keynote lecture Usoskin Ilya Sodankyla Geophysical Observatory, University of Oulu, Finland An overview of the present state of the art in studies of variability of various solar and cosmic-ray indices on different time scales is presented: from daily and shorter time scale, related to solar energetic particle events and Forbush decreases of cosmic rays; through interannual 11-year cyclic variability; to secular changes. Special emphasis is given to the possible reflection of these temporal variations in the terrestrial climate.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Thermospheric response to gravity wave coupling from the lower atmosphere Vadas Sharon NorthWest Research Assoc., CoRA div. In this talk, we discuss the response on the thermosphere to gravity waves from the lower atmosphere. In particular, we examine the spectrum of gravity waves excited by deep convective overshoot near the tropopause and by wave breaking near the mesopause. We examine which portion of these wave spectra can survive dissipative filtering and propagate into the thermosphere. We then calculate the horizontal body forces which result when these waves dissipate in the thermosphere. We examine their altitudinal, spatial, and temporal characteristics. We then determine the "mean" wind and secondary gravity wave responses which occur from these forcings using models and simulation. We then review the literature which shows evidence of these responses. This includes PFISR, CHAMP satellite, EISCAT, and TIDBBIT sounder published data. We also review recent global model simulations showing the effects of parameterized gravity wave dissipation on the thermosphere. Finally, we calculate the thermospheric response to 6 hours of deep convection in Brazil using a global model. We find that these forces create a ``mean'' eastward wind perturbation at z=150 km as large as 200-340 m/s. We find that these forces also excite large-scale secondary GWs for at least 3 hours with horizontal wavelengths of 4000 km and horizontal phase speeds of 600 m/s. We also show the scale and speeds of the medium scale secondary gravity waves that are excited by thermospheric body forces using our new compressible solutions.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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