- 行业: Weather
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The American Meteorological Society promotes the development and dissemination of information and education on the atmospheric and related oceanic and hydrologic sciences and the advancement of their professional applications. Founded in 1919, AMS has a membership of more than 14,000 professionals, ...
In hydrodynamic instability theory, a wave solution the amplitude of which does not change with time; it neither grows nor decays. In contrast, the amplitude of a growing mode (or wave) increases with time; that of a decaying mode (or wave) decreases with time. The latter two are unstable waves.
Industry:Weather
A condition of a system for which a small perturbation of a parcel of the system causes it to neither depart from its new position nor return to its previous one.
Industry:Weather
Term used in an ionospheric context to describe the nonionized component of the atmosphere.
Industry:Weather
A radiometer designed to measure the difference in irradiance coming from two opposing hemispheric fields of view. Typically, this instrument would be used to measure the difference of upwelling and downwelling irradiance at some level in the atmosphere, including the surface.
Industry:Weather
1. General name for instruments that measure, at more than one angle, the scattering function of particles suspended in a medium. Information obtained from such instruments may be used to determine the size of the suspended particles and the visual range through the medium. 2. Same as nephometer.
Industry:Weather
The difference between the solar radiation fluxes directed downward and upward; net flux of solar radiation.
Industry:Weather
The net flux density of terrestrial radiation. This is the difference between upwelling and downwelling longwave flux density, which may be referenced to any specified altitude, but is most commonly referenced to the surface. The long- term global average for the net terrestrial radiation leaving the earth's surface is approximately 50 W m<sup>−2</sup>.
Industry:Weather
System of small and mottled areas of enhanced brightness in the solar chromosphere. Their size varies from 5 to 20 arc-seconds. These features evolve from the plage areas and, like the plage, their number and intensity varies with the solar cycle. Also referred to as enhanced network, active network, and bright network.
Industry:Weather
Measure of the proximity of observing stations in a network established for some specific meteorological studies or research.
Industry:Weather
In general, the difference between absorbed and emitted radiation. Commonly used to refer to the surface radiation budget, but may be used more generally.
Industry:Weather
