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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Mesospheric/lower thermospheric winds and tides at low, middle, and high latitudes during the CAWSES Global Tidal Campaign observations in 2005-2010 Singer Werner 1 , Batista P.P. 2 , Oberheide Jens 3 , Grieger Norbert 1 , Nakamura Takuji 4 , Hoffmann Hoffmann 1 , Buriti R.A. 5 , Riggin Dennis 6 , Mitchell N.J. 7 , Ramkumar Geetha 8 , Schmidt Hauke 9 1 Leibniz Institute of Atmospheric Physics, Kuehlungsborn, Germany, 2 National Space Research Institute-INPE, Sao Jose dos Campos, SP, Brazil, 3 Physics Department, University of Wuppertal, Wuppertal, Germany, 4 National Institute of Polar Research, Tokyo, Japan, 5 Universidade Federal de Campina Grande, Paraiba, Brazil, 6 Northwest Research Associates, Boulder, CO, USA, 7 Centre for Space, Atmospheric & Oceanic Science, University of Bath, Bath, UK, 8 Space Physics Laboratory, Vikram Sarabhai Space Centre, Trivandrum, India, 9 Max-Planck-Institute of Meteorology, Hamburg, Germany Winds at mesospheric/lower thermospheric altitudes between 80 and 100 km and temperatures around 90 km are derived from all-sky meteor radar observations at latitudes between 22°S and 69°N. Wind tides are determined using 4-d, 10-d, and 60-d composite days. The seasonal variability of mean winds, diurnal, semi-diurnal, and ter-diurnal tides is presented. In addition, the seasonal variation of the migrating tides at 22°S has been derived using radar observations at three sites well separated in longitude (Learmonth, 114°E; Rarotonga, 200°E; Cachoeira Paulista, 315°E). The radar observations of the diurnal tidal signatures at 22°S are characterised by a strong longitudinal variability in good agreement with the results of the global circulation model HAMMONIA (HAMburg Model of the Neutral and Ionized Atmosphere). Comparisons are made between the tidal wind fields obtained from meteor radar observations and by superposing the tidal components from satellite analyses (TIMED). Both data sets are in good agreement and show that satellite and ground based observations are consistent with each other. The depicted strong longitudinal variability at 22°S is also seen in the reconstructed tidal wind fields of the HAMMONIA model. The dynamical response of the MLT region on solar activity phenomena is presented for severe solar proton events in October 2003, January 2005, and December 2006 with a reversal of the meridional winds down to about 75 km and a moderate reduction of zonal winds. Particular attention is devoted to the events in 2003 and 2005 in respect to enhanced turbulence related with changes of the background wind field and gravity wave propagation.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 The contribution of electron precipitation to middle atmosphere composition Sinnhuber Miriam 1 , Funke Bernd 2 , Kallenrode May-Britt 3 , Kazeminejad Shahin 4 , Stiller Gabrielle 5 , Wieters Nadine 1 , Wissing Jan-Maik 6 1 Institute of Environmental Physics, University of Bremen, Germany, 2 Instituto de Astrofisica de Andalucia, Andalucia, Spain, 3 University of Osnabrueck, Osnabrueck, Germany, 4 DLR, Bonn, Germany, 5 Karlsruhe Institute of Technology, Karlsruhe, Germany, 6 University of Osnabrueck, Germany Precipitating radiation belt electrons are a well known source of NOx (N, NO, NO2) in the lower thermosphere. There is mounting evidence of a strong indirect impact of precipitating electrons especially on the polar middle atmosphere due to downwelling of NO from the lower thermosphere during polar winter. However, not much is known about a direct impact on middle atmosphere composition, though during geomagnetic storms, electron energies are sufficient that electrons can precipitate well down into the middle atmosphere. We investigate possible direct and indirect impacts of precipitating electrons onto the middle atmosphere in two ways. On the one hand, we analyse long measurement records of middle atmosphere NOx, i.e., from HALOE / UARS, MIPAS/ENVISAT or SCIAMACHY / ENVISAT; on the other hand, we carry out and analyse model runs with the Bremen 3dimensional chemistry and transport model of the stratosphere and mesosphere which are driven by AIMOS ionisation rates including atmospheric ionisation due to protons and electrons. ~
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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