Measurement of radio-wave absorption in the atmosphere at 31.9 cm

Khrulev, V. V.; Khizhnyakova, I. P.

doi:10.1007/bf01032963

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Theoretical and Experimental Background1

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1974

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“…In recent years the Van Vleck theory has been largely vindicated of these criticisms. The discrepancy between measurement and theory rested on incomplete compensation of the radiometer measurements for antenna pattern effects [Lenoir et al, 1968;Khrulev and Khizhnyakova, 1968;Ho et al, 1972] and atmospheric refraction [Howell and Shakeshaft, 1967]. The precise description of oxygen absorption is, however, still lacking in as much as empirical descriptions of all line breadth parameters are as yet incomplete.…”

Section: Theoretical and Experimental Backgroundmentioning

confidence: 99%

A simple formulation of oxygen absorption at centimeter wavelengths

Claassen¹,

Fung

1974

J. Geophys. Res.

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Carefully performed experiments by a number of investigators have supported the Van Vleck line shape theory for oxygen absorption in the lower‐frequency wing (0–50 GHz). In view of the frequent need to compute oxygen absorption at centimeter wavelengths and lower a computationally simple fourline absorption model based on the Van Vleck theory is offered. The approximation yields computational accuracy better than 1% over the entire range of atmospheric pressures and temperatures for frequencies less than 30 GHz when it is compared with the Van Vleck 45‐line expression. The versatility of the model in adapting to various line‐broadening expressions is also shown. Instead of refining the present theories, this communication is mainly intended to propose a more convenient formulation to compute oxygen absorption.

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Section: Theoretical and Experimental Backgroundmentioning

confidence: 99%