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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Analyses of gravity waves using simultaneous measurements of winds and temperatures Placke Manja , Hoffmann Peter , Gerding Michael , Rapp Markus , Becker Erich Leibniz Institute of Atmospheric Physics at the Rostock University MF and Meteor radar measurements are excellent tools for the continuous monitoring of upper mesospheric winds between about 70 and 95 km. In particular, wind fluctuations caused by atmospheric waves can be identified and studied over extended time periods. However, the investigation of their vertical propagation is obviously limited to the height range where radar observations are feasible. With lidar measurements, wave-induced temperature fluctuations can be studied from the ground up to the MLT region. Here, however, the temporal coverage is limited especially to nighttime and cloud-free atmospheric conditions. Therefore, the combination of radar and lidar techniques allows the investigation of vertical wave structures over an extended altitude and time range. The present study is based on wind observations using the MF and Meteor radars at Juliusruh (54.6°N, 13.4°E) and on temperature measurements using the RMR and Potassium lidar at Kühlungsborn (54.1°N, 11.8°E). Common volume and simultaneous measurements are used to identify wave packages using the polarization relations between temperature and wind fluctuations. Finally, the results are compared to the characteristics of gravity waves over an extended altitude range derived from simulations with the wave-resolving mechanistic general circulation model KMCM.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 The Geophysical Impacts and ENA Signatures of Ring Current Ion Precipitation into the Thermosphere and Ionosphere Pollock Craig 1 , Mackler David 2 , Mitchell Donald 3 1 2 3 Southwest Research Institute, University of Texas at San Antonio, Applied Physics Laboratory at Johns Hopkins University We present observations from NASA's IMAGE and TWINS missions of the intense ENA emissions emanating from the foot points of geomagnetic field lines connected to the Earth's ring current during geomagnetic storms. We describe analyses performed using these observations to specify the spatial and pitch angle distributions of the emitted ENAs and present the results of these. We also describe progress on an effort, recently begun, in which in-situ observations of ion precipitation are analyzed and compared with simultaneous observations of ENAs emitted from precipitation foot points, in order to estimate the distribution of ENAs resulting from an element of ion precipitation. Finally, we describe future observations that may be used to constrain the relationship between precipitating ions and the resultant ENA signatures, with the ultimate goal of being able to specify the ion precipitation using ENA observations.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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