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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Line-core and line-wing features in the temperature-dependent MgHe emission/absorption spectra Bouledroua Moncef 1 , Reggami Lamia 2 1 Faculté de Médecine and Laboratoire de Physique des Rayonnements, Badji Mokhtar University, Annaba, Algeria, 2 Departement de Physique, Badji Mokhtar University, Annaba, Algeria The present study deals with the collisional broadening of the monoatomic magnesium, evolving in a ground helium gas, in the wavelength and temperature ranges 260-310 nm and 100-3000 K, respectively. The emission and absorption spectral profiles, which might be generated from our theoretical computations, are based on the most recent potential-energy curves and transition dipole moments. The required interatomic Mg(3s2)-He and Mg(3s3p)- He potentials are constructed from two different sets.1 The purpose of this treatment is twofold. First, using the quantum-mechanical Baranger impact approximation,2,3 the width and shift of the line core of the spectra are determined and their variation law with temperature is examined. Then, the satellite structures in the blue and red wings are analyzed quantum mechanically.4-6 The calculations show especially that the free-free transitions are the most contributive in the MgHe photoabsorption spectra and a satellite structure is observable beyond the temperature 2000 K around the wavelengths 272 or 276 nm, depending on the used potential set. For both cases, the obtained results agree quite well with those already published. References [1] L. Reggami and M. Bouledroua, to be submitted (2010). [2] M. Baranger, Phys. Rev. 111, 481 (1958). [3] M. Bouledroua, A. Dalgarno, and R. Côté, Phys. Rev. A 65, 012701 (2001). [4] K. Sando and A. Dalgarno, Mol. Phys. 20, 103 (1971). [5] H.-K. Chung, K. Kirby, and J.F. Babb, Phys. Rev. A 63, 032516 (2001). [6] K. Alioua and M. Bouledroua, Phys. Rev. A 74, 032711 (2006).
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Measurements of Solar and Atmospheric Phenomena and Coupling using SCIAMACHY on board ENVISAT 2002 - present. Burrows John , Von Savigny Chrsitian , Bovensmann Heinrich , Noel Stefan , Bramstedt Klaus , Rozanov Alexij , Eichmann Kai-Uwe , Rapue Nabiz , Dikty Sebastian , Sinnhuber Miriam , Ernst Florian , Paragan Joseph , Weber Mark Institute of Environmental Physics and Remote Sensing, University of Bremen The Scanning Imaging Absorption spectrometer for Atmospheric Chartography, SCIAMACHY, is a national contribution, funded by Germany, The Netherlands and Belgium to the ESA ENVISAT platform, which was launched on the 28 th February 2002. SCIAMACHY has a variety of different scientific objectives makes measurements of the extra terrestrial solar emission and the upwelling radiance at the top of the atmosphere in a variety of viewing directions between 214 and 23800 nm. The limb and solar occultation measurements of SCIAMACHY yield unique information about the stratosphere, the mesosphere, and thermosphere. In this context we are able to investigate a diverse set of phenomena, including the impact of solar variability on the upper atmosphere, meteoritic ablation in the atmosphere and its consequences, polar mesospheric clouds and stratospheric ozone and aerosol chemistry and dynamics. This presentation describes selected highlights from our use of SCIAMACHY to investigate and understand these phenomena.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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