Search

Your search keyword '"Gurvich, A. S."' showing total 270 results
Start Over Author "Gurvich, A. S."
270 results on '"Gurvich, A. S."'

14. Similarity relations and their experimental verification for strong intensity fluctuations of laser radiation

Author

Gracheva, M. E., Gurvich, A. S., Kashkarov, S. S., Pokasov, VI V., Amelinkcx, S., editor, Chebotayev, V. P., editor, Gomer, R., editor, Ibach, H., editor, Letokhov, V. S., editor, Lotsch, H. K. V., editor, Queisser, H. J., editor, Schäfer, F. P., editor, Seeger, A., editor, Shimoda, K., editor, Tamir, T., editor, Welford, W. T., editor, Wijn, H. P. J., editor, and Strohbehn, John W., editor

Published
1978
Full Text
View/download PDF

16. Chromatic refraction with global ozone monitoring by occultation of stars. I. Description and scintillation correction

Author

Dalaudier, Francis, Kan, Valery, and Gurvich, Alexandre S.

Subjects
Astronomy, Physics
Abstract

We describe refractive and chromatic effects, both regular and random, that occur during star occultations by the Earth's atmosphere. The scintillation that results from random density fluctuations, as well as the consequences of regular chromatic refraction, is qualitatively described. The resultant chromatic scintillation will produce random features on the Global Ozone Monitoring by Occultation of Stars (GOMOS) spectrometer, with an amplitude comparable with that of some of the real absorbing features that result from atmospheric constituents. A correction method that is based on the use of fast photometer signals is described, and its efficiency is discussed. We give a qualitative (although accurate) description of the phenomena, including numerical values when needed. Geometrical optics and the phase-screen approximation are used to keep the description simple. [C] 2001 Optical Society of America OCIS codes: 290.5930, 010.1320, 010.1330, 120.0280, 010.4950.

Published
2001

17. Chromatic refraction with global ozone monitoring by occultation of stars. II. Statistical properties of scintillations

Author

Kan, Valery, Dalaudier, Francis, and Gurvich, Alexandre S.

Subjects
Astronomy, Physics
Abstract

The statistical properties of stellar scintillations are discussed with special attention to correcting the atmospheric transmittance data for scintillations in measurements made with the Global Ozone Monitoring by Occultation of Stars (GOMOS) instrument. Both anisotropic and isotropic turbulent inhomogeneities are taken into account. Calculated rms scintillation reaches several percent for altitudes of 30-35 km, an amplitude comparable with the expected absorbing features. Estimates of cross-correlation functions show that the GOMOS correction procedure can be applied efficiently for scintillations caused by anisotropic inhomogeneities, in contrast to the isotropic case. Some recommendations are given for conditions of observations with which to make better corrections of scintillations. [C] 2001 Optical Society of America OCIS codes: 290.5930, 010.1300, 010.1320, 010.1330, 000.5490.

Published
2001

18. Gravity wave and turbulence spectra parameters retrieved from scintillation measurements by GOMOS/Envisat

Author

Sofieva, Viktoria, Dalaudier, Francis, Gurvich, Alexandre S., Kan, Valery, Finnish Meteorological Institute (FMI), STRATO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), A.M.Obukhov Institute of Atmospheric Physics (IAP), Russian Academy of Sciences [Moscow] (RAS), and Cardon, Catherine

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], Astrophysics::Earth and Planetary Astrophysics, [PHYS.PHYS.PHYS-AO-PH] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], Physics::Atmospheric and Oceanic Physics
Abstract

International audience; Satellite measurements of stellar scintillation in limb-viewing geometry provide unique information about small-vertical-scale gravity waves (GW) in the stratosphere and their breaking into turbulence. In our presentation, we show the results of analyses of scintillation measurements carried out by GOMOS (Global Ozone Monitoring by Occultation of Stars) fast photometers on board the Envisat satellite in 2002-2012. GOMOS scintillation measurements allow retrievals of inner of outer scales of gravity waves, GW structure characteristic and potential energy per unit mass, as well as reconstruction of turbulence structure characteristic C _{T} (2) in the stratosphere. GW and turbulence spectra parameters are retrieved by fitting modeled scintillation spectra to measured spectra. In our presentation, we explain the data analysis and show spatio-temporal distributions of gravity wave and turbulence spectra parameters in the stratosphere.

Published
2014

Catalog

Books, media, physical & digital resources
See catalog results