Study on the Measurement of Isoplanatic Angle Using Stellar Scintillation

2014 ◽  
Vol 34 (3) ◽  
pp. 0301001 ◽  
Author(s):  
于龙昆 Yu Longkun ◽  
沈红 Shen Hong ◽  
靖旭 Jing Xu ◽  
侯再红 Hou Zaihong ◽  
吴毅 Wu Yi
Keyword(s):  
Stellar Scintillation

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

2014 ◽  
Vol 7 (6) ◽  
pp. 1861-1872 ◽  
Author(s):  
V. Kan ◽  
V. F. Sofieva ◽  
F. Dalaudier
Keyword(s):  
Satellite Observations ◽  
Small Scale ◽  
Anisotropy Coefficient ◽  
Atmospheric Parameters ◽  
Air Density ◽  
Ozone Monitoring ◽  
D Model ◽  
Vertical Scales ◽  
Stellar Scintillation ◽  
Variable Anisotropy

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.

Measurements of the wavelength dependence and other properties of stellar scintillation at Mauna Kea, Hawaii

1982 ◽  
Vol 21 (7) ◽  
pp. 1196 ◽  
Author(s):  
J. C. Dainty ◽  
B. M. Levine ◽  
B. J. Brames ◽  
K. A. O’Donnell
Keyword(s):  
Wavelength Dependence ◽  
Stellar Scintillation

scholarly journals Seeing Effects on Occultation Curves

1971 ◽  
Vol 2 ◽  
pp. 622-623 ◽  
Author(s):  
A. T. Young
Keyword(s):  
Diffraction Pattern ◽  
Aerial Photography ◽  
Point Of View ◽  
Image Motion ◽  
The Moon ◽  
The Earth ◽  
Stellar Occultation ◽  
Image Blur ◽  
Stellar Scintillation ◽  
Astronomical Seeing

‘Seeing’ affects the light-curve of a stellar occultation by the Moon in two ways: the diffraction pattern on the ground is smeared out by atmospheric turbulence, and the pattern also suffers random displacements. These effects are analogous to the familiar image blur and image motion, respectively. However, there is a major difference between ordinary astronomical seeing and the effect on the lunar diffraction pattern: the former is the seeing looking up at the sky from the bottom of the atmosphere, but the latter corresponds to the seeing looking down through the atmosphere at the surface of the Earth.This downward-looking seeing is of concern to people engaged in aerial photography and satellite reconnaissance, and has been studied theoretically from this point of view. It also enters into the theory of stellar scintillation, because the seeing blurs out the scintillation shadow pattern just as it blurs out the occultation diffraction pattern.

Sign in / Sign up

Export Citation Format

Share Document