Atmospheric Attenuation

atmospheric attenuation

[¦at·mə¦sfir·ik ə‚ten·yə′wā·shən]
A process in which the flux density of a parallel beam of energy decreases with increasing distance from the source as a result of absorption or scattering by the atmosphere.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Atmospheric Attenuation


a reduction in the intensity of electromagnetic radiation in the earth’s atmosphere as a result of the absorption and scattering of the radiation.

Solar radiation is absorbed primarily by water vapor and ozone and is scattered by molecules of air and aerosols. Scattering plays the main role in the atmospheric attenuation of solar radiation. The attenuation of long-wavelength terrestrial radiation from the earth’s surface, from the air, and from clouds also occurs in the atmosphere.

Atmospheric extinction, or the attenuation of starlight in the atmosphere, is especially important to take into account in astronomical observations. The intensity of atmospheric extinction depends both on the wavelength used for an observation and on the zenith distance of the celestial body being observed. The same celestial body appears three stellar magnitudes fainter at the horizon than at the zenith.


Kondrat’ev, K. Ia. Luchistyi teploobmen v atmosfere. Leningrad, 1956.
Kondrat’ev, K. Ia. Aktinometriia. Leningrad, 1965.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
"Microwave power beaming can be more efficient than lasers, and is less prone to atmospheric attenuation caused by dust or water vapour, and are less dangerous.
Second, it's very sensitive to weather condition which is (atmospheric attenuation and atmospheric turbulence) [2].
Such values are corrected for atmospheric attenuation. In particular, they refer to precise measurements acquired three times a day.
E-band spectrum's characteristics, such as wider communications channels, higher linearity and lower atmospheric attenuation compared with other spectrum bands, make it ideal for large-capacity wireless transmission.
He covers the real-time measurement of meteorological parameters for estimating low altitude atmospheric turbulence strength, comparing different models for ground-level atmospheric attenuation and turbulence strength prediction with new models according to local weather data for free space optical applications, mitigating beam wandering due to atmospheric turbulence and predicting control quality using intelligent decision making tools, low-power and compact response surface model and neural-controller design for beam wandering mitigation with a horizontal-path propagating Gaussian-beam wave: focused beam case, and quality metrics and reliability analysis of ground-to-ground free space laser communication in different weather conditions together with a beam steering system.
The atmospheric attenuation model describes the way light gets attenuated as it traverses from a scene point to the observer.
Such radars are also more resistant to atmospheric attenuation, a process by which a proportion of the radar's transmitted Radio Frequency (RF) energy is absorbed by moisture in the air.
Consequently the wireless industry is facing a crisis in its ability to keep up with the demand for backhaul capacity, and Janus AirDuplex provides a way to achieve higher throughput without resorting to using the millimetre-wave frequency bands above 42 GHz, offer broader bandwidths but suffer atmospheric attenuation and also often attract higher licensing fees."
Evaluation Based on CCDFs of Total Atmospheric Attenuation at 100 GHz and 300 GHz
Following are various parameters that contribute to the link margin are transmitted Power ([P.sub.t]), beam width of transmitter, surface area of transmit beam at range R ([A.sub.T]), optical link range (R), and atmospheric attenuation coefficient ([alpha] in dB/km).
Take care if making observations, and follow all the solar observing protocols, even though the Sun will be low and have more atmospheric attenuation.

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