Determination of parameters of the spectrum of internal waves in the stratosphere from space-based observations of strong stellar scintillation

Gurvich, A. S.; Воробьев, В. В.; Федорова, О. В.

doi:10.1134/s0001433806040062

Cited by 12 publications

(14 citation statements)

References 7 publications

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“…The appearance of the constriction in the dependence F I (k z , k y ) at k z = 0 is due to both a decrease in the rate of increasing the model spectral density (4) for K ⊥ → 0 and the anisotropy of the irregularities. This constriction disappears in the case of statistically isotropic irregularities when the parameter η tends to unity [7,8]. Due to the presence of the factor exp(−l 2 0 K 2 ⊥ ) in Eq.…”

Section: Two-dimensional Scintillation Spectra and Qualitative Analysmentioning

confidence: 89%

“…(9) are isotropic. It was mentioned in [7,8] that this fact results in different behavior of one-dimensional scintillation spectra (11) in the region of small wave numbers when performing observations conditions through an isotropic medium or a medium having axial symmetry.…”

Section: Equations For the Scintillation Spectra After A Statisticallmentioning

confidence: 97%

“…Therefore, for describing one-dimensional spectra, there is no alternative to numerical methods. It follows from the analysis of two-dimensional scintillation spectra [7,8] that in the region of small wave numbers (i.e., for large-scale irregularities), the behavior of one-dimensional spectra essentially depends on the anisotropy of the irregularities producing the scintillations.…”

Section: Introductionmentioning

confidence: 99%

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Strong scintillation spectra behind a phase screen containing large-scale anisotropic irregularities

Gurvich

Воробьев

Marakasov

et al. 2007

Radiophys Quantum El

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Using the approximation of an anisotropic statistically-homogeneous phase screen, we consider spectra of strong scintillations. Numerical calculations are made for the model of large-scale anisotropic inhomogeneities typical of the Earth's stratosphere. The spectrum transformation is studied for the transition from weak scintillations to the asymptotic regime of strong scintillations. We show that with increasing level of the scintillations, their spectra rapidly broaden to the region of large wave numbers which exceed both the inverse internal scale of the irregularities and the inverse radius of the Fresnel zone by orders of magnitude. Notable deviations of the two-dimensional spectra from the predictions based on perturbation theory are shown to occur for scintillation variance exceeding 0.1. The obtained two-dimensional spectra of scintillations give a complete picture of the behavior of one-dimensional spectra which can be retrieved from satellite observations made for different angles between the orbit plane and the direction to the source. Vertical and horizontal one-dimensional spectra are studied in detail. Approximate algebraic formulas are derived and their validity is proved by applying them to the calculation of spectra of strong scintillations for a wide (several decades) range of the wave number values.

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Section: Two-dimensional Scintillation Spectra and Qualitative Analysmentioning

confidence: 89%

Section: Equations For the Scintillation Spectra After A Statisticallmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Strong scintillation spectra behind a phase screen containing large-scale anisotropic irregularities

Gurvich

Воробьев

Marakasov

et al. 2007

Radiophys Quantum El

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“…The lower limit is dictated by the weak scintillation assumption used in the forward model. The analysis [67] has shown that the parameters of the three-dimensional spectra of stratospheric irregularities can be retrieved under conditions of relatively strong scintillation. However, computing the scintillation spectra for strong scintillation requires rather heavy numerical calculations, which are hardly compatible with an iterative nonlinear fitting procedure, for application to the vast amount of satellite data.…”

Section: (E) Perspectives and Discussionmentioning

confidence: 99%

“…The theory of strong scintillations applied to the stellar occultation measurements has been further developed by Gurvich et al [67]. That paper considers the problem of remote sensing of stratospheric irregularities under strong scintillation conditions.…”

Section: Theory Of Scintillationmentioning

confidence: 99%

Using stellar scintillation for studies of turbulence in the Earth’s atmosphere

Sofieva

Dalaudier

Vernin

2013

Phil. Trans. R. Soc. A.

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International audienceStellar scintillation observed through the Earth's atmosphere is the result of interaction of light waves and the turbulent atmosphere. This review is dedicated to using stellar scintillation measurements for studies of turbulence in the Earth's atmosphere. We present an overview of ground-based, air-borne and satellite stellar scintillation measurements, discuss the approaches to data analyses and give an overview of the main geophysical results. We also discuss the benefits of the scintillation method in studies of the structure of air density irregularities and its limitations

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Global analysis of scintillation variance: Indication of gravity wave breaking in the polar winter upper stratosphere

Sofieva¹,

Kyrölä²,

Hassinen³

et al. 2007

Geophysical Research Letters

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Stellar scintillations observed through the Earth atmosphere are caused by air density irregularities generated mainly by internal gravity waves and turbulence. We present global analysis of scintillation variance in two seasons of year 2003 based on GOMOS/Envisat fast photometer measurements. Scintillation variance can serve as a qualitative indicator of intensity of small-scale processes in the stratosphere. Strong increase of scintillation variance at high latitudes in winter is observed. The maximum of scintillation variance can be associated with the polar night jet. The simplified spectral analysis has shown the transition of scintillation spectra toward small scales with altitude, which is probably related with turbulence appearing as a result of wave breaking. The breaking of gravity waves in the polar night jet seems to start in the upper stratosphere, a predicted, but not confirmed by observations before, feature. Weaker enhancements in tropics are also observed; they might be related to tropical convection

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Determination of parameters of the spectrum of internal waves in the stratosphere from space-based observations of strong stellar scintillation

Cited by 12 publications

References 7 publications

Strong scintillation spectra behind a phase screen containing large-scale anisotropic irregularities

Strong scintillation spectra behind a phase screen containing large-scale anisotropic irregularities

Using stellar scintillation for studies of turbulence in the Earth’s atmosphere

Global analysis of scintillation variance: Indication of gravity wave breaking in the polar winter upper stratosphere

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