On the wavelength dependence of the effects of turbulence on average refraction angles in occultations by planetary atmospheres

Details On the wavelength dependence of the effects of turbulence on average refraction angles in occultations by planetary atmospheres On the wavelength dependence of the effects of turbulence on average refraction angles in occultations by planetary atmospheres

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229..393h&link_type=abstract

Astrophysical Journal, Part 1, vol. 229, Apr. 1, 1979, p. 393-398; Comment, p. 399-401. Research supported by the Norges Teknis

Physics

Optics

1

Atmospheric Refraction, Lunar Occultation, Planetary Atmospheres, Turbulence Effects, Wavelengths, Atmospheric Radiation, Fresnel Region, Kolmogoroff Theory, Optics, Power Spectra, Radii

Scientific paper

The dependence of the effects of planetary atmospheric turbulence on radio or optical wavelength in occultation experiments is discussed, and the analysis of Hubbard and Jokipii (1977) is criticized. It is argued that in deriving a necessary condition for the applicability of their method, Hubbard and Jokipii neglect a factor proportional to the square of the ratio of atmospheric or local Fresnel zone radius and the inner scale of turbulence, and fail to establish sufficient conditions, thereby omitting the square of the ratio of atmospheric scale height and the local Fresnel zone radius. The total discrepancy is said to mean that the results correspond to geometrical optics instead of wave optics, as claimed, thus being inapplicable in a dicussion of wavelength dependence. Calculations based on geometrical optics show that the bias in the average bending angle depends on the wavelength in the same way as does the bias in phase path caused by turbulence in a homogeneous atmosphere. Hubbard and Jokipii comment that the criterion of Haugstad and Eshleman is incorrect and show that there is a large wave optical domain where the results are independent of wavelength.

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