Articles | Volume 7, issue 6
Atmos. Meas. Tech., 7, 1861–1872, 2014

Special issue: Limb observations of the middle atmosphere by space- and airborne...

Atmos. Meas. Tech., 7, 1861–1872, 2014

Research article 25 Jun 2014

Research article | 25 Jun 2014

Variable anisotropy of small-scale stratospheric irregularities retrieved from stellar scintillation measurements by GOMOS/Envisat

V. Kan1, V. F. Sofieva2, and F. Dalaudier3 V. Kan et al.
  • 1A.M. Obukhov Institute of Atmospheric Physics Russian Academy of Sciences, Moscow, Russia
  • 2Finnish Meteorological Institute, Helsinki, Finland
  • 3Université Versailles St-Quentin, UPMC University Paris 06, CNRS/INSU, LATMOS-IPSL, 78280 Guyancourt, France

Abstract. In this paper, we consider possibilities for studying the anisotropy of small-scale air density irregularities using satellite observations of bi-chromatic stellar scintillations during tangential occultations. Estimation of the anisotropy coefficient (the ratio of the characteristic horizontal to vertical scales) and other atmospheric parameters is based on the comparison of simulated/theoretical and experimental auto-spectra and coherency spectra of scintillation. Our analyses exploit a 3-D model of the spectrum of atmospheric inhomogeneities, which consists of anisotropic and isotropic components. For the anisotropic component, a spectral model with variable anisotropy is used. Using stellar scintillation measurements by GOMOS (Global Ozone Monitoring by Occultation of Stars) fast photometers, estimates of the anisotropy coefficient are obtained for atmospheric irregularities with vertical scales of 8–55 m at altitudes of 43–30 km. It is shown that the anisotropy increases from about 10 to 50 with increasing vertical scales.