airglow


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airglow,

faint diffuse illumination of the sky originating in the upper atmosphere. Although it occurs at all times of day throughout the upper atmosphere, it is most typically visible to an observer on earth on dark nights, above the horizon. The energy in the form of visible light is derived from the sun's ultraviolet light, which ionizes atoms and dissociates molecules at heights between 40 and 200 mi (64–322 km) above the earth's surface. When the fragments collide and recombine, some atoms and molecules are left with excess energy, which they release as light at characteristic wavelengths. Most prominent in the visible spectrum are the red and green light of oxygen and the yellow light of sodium. In southern and northern polar regions the airglow is often masked by the aurora (see aurora borealisaurora borealis
and aurora australis
, luminous display of various forms and colors seen in the night sky. The aurora borealis of the Northern Hemisphere is often called the northern lights, and the aurora australis of the Southern Hemisphere is known as the southern
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). Airglow hampers optical telescopic observations on earth by reducing the apparent contrast between stars and space.

airglow

(air -gloh) (nightglow) The faint everpresent glow arising in the Earth's atmosphere that is light emitted (along with infrared radiation) during the recombination of ionized atoms and molecules following collisions with high-energy particles and radiation, mainly from the Sun. Airglow interferes with optical and infrared observations of faint celestial bodies.

Airglow

 

the luminescence of gases found in the upper atmosphere at altitudes above 70–80 kilometers; an important component of the luminescence of the night sky.

Airglow exhibits not only a continuous spectrum but also atomic emission lines of oxygen, hydrogen, and sodium and molecular bands of the hydroxyl radical, oxygen, carbon dioxide, ozone, water, and nitrogen oxides. The emission of the individual components of airglow occurs at various altitudes in strata of varying thickness. The altitude and thickness of the layers may change. One of the main energy sources for airglow is the energy of solar radiation, which causes dissociation and ionization in the upper atmosphere; the subsequent recombination of particles produces airglow.

The intensity of all the emissions depends on the degree to which the upper atmosphere is illuminated, on the density, temperature, and composition of the upper atmosphere at the altitudes where the emissions occur, on solar and geomagnetic activity, and on the latitude of the observation site. There are daily and seasonal cycles.

The mechanisms responsible for airglow have not yet been fully explained. Observations of the spectra of airglow and of variations in its intensity dependent on heliogeophysical conditions are widely used to obtain data on the composition, density, temperature, and other properties of the atmosphere at high altitudes.

REFERENCE

Chamberlain, J. Fizika poliarnykh siianii i izlucheniia atmosfery. Moscow, 1963. (Translated from English.)

IU. L. TRUTTSE

airglow

[′er‚glō]
(geophysics)
The quasi-steady radiant emission from the upper atmosphere over middle and low latitudes, as distinguished from the sporadic emission of auroras which occur over high latitudes. Also known as light-of-the-night-sky; night-sky light; night-sky luminescence; permanent aurora.
References in periodicals archive ?
Airglow is a phenomenon in our Earth's upper atmosphere, more specifically the ionosphere.
WASHINGTON (CyHAN)- Bright swaths of red in the upper atmosphere, known as airglow, can be seen in this video captured by the International Space Station.
The distinct, bright zone above the horizon (visible at image top) is airglow, a phenomenon caused by excitation of atoms and molecules high in the atmosphere (above 80 kilometers, or 50 miles altitude) by ultraviolet radiation from the Sun.
While Earth imaging has been the main focus of the research on CubeSat imaging systems [8-15], other applications, such as star tracking [12,16-19], horizon tracking [12,16], attitude calibration [20], proximity monitoring [8,17,21-23], heliospheric imaging [24], and airglow observations [25,26] have also been presented.
Takahashi et al., "Ionospheric plasma bubble climatology over Brazil based on 22 years (19771998) of 630 nm airglow observations," Journal of Atmospheric and Solar-Terrestrial Physics, vol.
Passive airglow monitoring is a simple and cost effective method which provides required temporal resolution to study the short period gravity waves with periodicity.
The guests of honour on this occasion included Lord Rayleigh (Robert Strutt, the fourth Baron Rayleigh) who was the first person to differentiate between the two types of natural light from the night sky, namely the aurora and the airglow. Another distinguished guest was Prof H.
Instrument Location Date(s) in Seasons Principal service (1) measurement Aerosol Mass PRL 2006- A aerosol Spectrometer composition All Sky Imager PRL 2007- W airglow images Fourier Transform PRL 2006- S trace gas Spectrometer partial column amounts Brewer Ozone PRL 2005- A ozone column Spectrophotometer amounts and Umkehr profiles CIMEL PRL 2007-11 S aerosol Sunphotometer optical depth DIAL (stratospheric PRL 1993-2008 W ozone, water ozone) Lidar vapour, aerosol and temperature profiles E-Region Wind PRL 2008- W mesospheric Instrument winds Spectral Airglow PRL 2007- W mesospheric Temperature temperatures Interferometer UV-Visible Grating PRL 2006- S ozone.
The light, known as airglow, is produced when atoms and molecules are excited by ultraviolet sunlight or electrically charged particles.
The Ainglow building housed both the Airglow experiment, measuring the atmospheric glow as well as the photographic recording equipment of a seismograph, run by the South African Geological Survey.
A thin yellow-brown band tracing the Earth's curvature at image top is airglow, a faint band of light emission that results from the interaction of atmospheric atoms and molecules with solar radiation at approximately 100 kilometers (60 miles) altitude.
Among some fifty unadapted transfers from English found in the Devoto-Oli dictionary in the entries under A we find contemporary terms such as abstract, acid music, acting out, after hours, airbus, all inclusive, all right, anchor man, antidumping, antismog, anti-spam, appeasement, area manager, attachment, auditing, autofocus, as well as terms absent from the latest Zingarelli edition (Zingarelli 2009) such as access provider, add-on, adware, afro rock, airglow, american bar, anchor woman, anti-age, audiweb, avenue.