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airglow

Overview page. Subjects: Astronomy and Astrophysics — Meteorology and Climatology.

A weak background emission of light over the whole sky, resulting mainly from the excitation of atmospheric oxygen at an altitude of around 100 km by solar radiation; also known as nightglownull...

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Aqua

Overview page. Subjects: Meteorology and Climatology — Astronomy and Astrophysics.

A NASA polar-orbiting satellite, part of the Earth Observing System, the second to be launched (after the Terra satellite) on 4 May 2002. It is primarily designed to monitor the Earth's...

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Aura

Overview page. Subjects: Meteorology and Climatology — Astronomy and Astrophysics.

A NASA polar-orbiting satellite, part of the Earth Observing System, the third to be launched (after the Terra and Aqua satellites). Its principal mission is to monitor atmospheric...

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aurora

Overview page. Subjects: Astronomy and Astrophysics — Meteorology and Climatology.

An emission of light from the Earth's high atmosphere, caused principally by oxygen atoms or nitrogen molecules that are excited by electrons accelerated within the magnetosphere. The...

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auroral oval

Overview page. Subjects: Meteorology and Climatology — Astronomy and Astrophysics.

A high-latitude ring of more or less permanent aurora, girdling the geomagnetic pole at a distance of 2000–2500 km under quiet geomagnetic conditions. There are two ovals, one in either...

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automatic picture transmission

Overview page. Subjects: Meteorology and Climatology — Astronomy and Astrophysics.

(APT)

The continuous transmission of images of the Earth by polar-orbiting meteorological satellites. The radiometer scan is perpendicular to the plane of the satellite's orbit, so...

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black-body radiation

Overview page. Subjects: Meteorology and Climatology — Astronomy and Astrophysics.

The radiation emitted by a hypothetical black body, i.e. one that is capable of both absorbing all radiation incident upon it and radiating the maximum possible intensity of radiation for a...

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brightness temperature

Overview page. Subjects: Meteorology and Climatology — Astronomy and Astrophysics.

(T B or T b)

The apparent temperature of an astronomical source calculated on the assumption that the source is a black-body emitter. For a thin plasma, the...

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Cloudsat

Overview page. Subjects: Meteorology and Climatology — Astronomy and Astrophysics.

A NASA polar-orbiting satellite, launched (together with Calipso) on 26 April 2006, and now part of the Afternoon-Train constellation. It is specifically designed to monitor clouds with a...

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coronal hole

Overview page. Subjects: Astronomy and Astrophysics — Meteorology and Climatology.

A region in the Sun's corona of very low density, about 100 times less than that of coronal active regions. Coronal holes show up as apparent voids in X-ray images or, at the limb, by an...

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