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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Morphology of 557.7 nm dayglow emission under varying solar activity conditions Sunil Krishna MV , Singh Vir Indian Institute of Technology Roorkee The atomic oxygen emission at 557.7 nm is the most widely observed airglow feature in the upper mesosphere and lower thermospheric regions. The approximation of solar irradiance fluxes is very crucial in the modeling of this emission. The recently introduced Solar2000 EUV flux model is a suitable candidate to provide the solar EUV flux for any level of solar activity on any given day. The Solar2000 EUV flux model has not been tested for its applicability in the airglow modeling studies. In the present study a comprehensive model has been developed to study the 557.7 nm dayglow emission using Solar2000 EUV flux model. This study presents the model results of diurnal and yearly variations of 557.7 nm dayglow emission under equinox conditions. The effect of varying solar activity on this emission is studied for a period of five years (2001-2005) at a fixed date of April 3. This date is chosen due to the fact of large variations in the solar activity during the period of five years. The volume emission rates obtained from the model in the upper mesospheric region are found higher than the observed results. This discrepancy is due to the extremely high values of solar EUV flux generated by the Solar2000 EUV flux model at 102.5 and 103.7 nm wavelengths. The model is found in good agreement with the measurements in the thermospheric region. The morphology is presented as a function of F10.7 solar index for five years (2001 – 2005) equator and 45◦ N at a fixed longitude.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Middle atmosphere sources of non-migrating tides, and non-linear interaction of tidal components Suvorova Ekaterina 1 , Jacobi Christoph 2 , Pogoreltsev Alexander 1 1 Russian State Hydrometeorological University, 2 University of Leipzig, Institute for Meteorology The tidal oscillations of the wind and temperature are one of the basic processes which are responsible for the formation of dynamical and thermal regimes in the mesosphere and lower thermosphere (MLT) region. The study of the variability of atmospheric tides and their sources is the key for understanding of the energetics and dynamics of this atmospheric region. On the base of simulation with the Middle and Upper Atmosphere Model (MUAM) the relative role those sources of nonmigrating tides is considered that are situated in the middle atmosphere. It is shown that when planetary waves are strong in the stratosphere (for instance, during sudden stratospheric warming events), the main middle atmosphere contribution into the generation of nonmigrating tides is nonlinear interaction between migrating tides and the stationary planetary wave with zonal wave number m=1. Largescale longitudinal ozone inhomogeneities lead to additional sources of nonmigrating semidiurnal (m = 1) and diurnal (m = 2) tides. Filtration of the thermal sources of the different tidal components in the MUAM allows us to investigate the generation of secondary migrating tides due to nonlinear interaction between the primary thermal tides and estimate the contribution of the diurnal and semidiurnal tides to the formation of the zonally averaged circulation in the MLT region.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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