- 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, ...
A satellite in an equatorial or near-equatorial orbit that orbits with the same angular velocity as the earth, making one revolution in 24 hours. Note that a geosynchronous orbit is not necessarily also in a geostationary orbit. See geostationary satellite.
Industry:Weather
A scale of yellows, greens, and blues for recording the color of seawater, as seen against the white background of a Secchi disk.
Industry:Weather
A satellite in a west-to-east orbit at an altitude of 35 786 km (19 600 n mi) above the equator. At this altitude, it circles the axis of the earth once every 24 hours, making its speed in orbit synchronous with the earth's rotation. A geostationary orbit is geosynchronous, but it is also required to have zero inclination angle (orbital plane coincides with the earth's equatorial plane) and zero eccentricity (a perfectly circular orbit). Geostationary satellites (such as GOES, Meteosat, and GMS) remain essentially stationary over a given geographical point above the equator. See geosynchronous satellite.
Industry:Weather
A round or slightly elongated area of light seen in the night sky along the zodiac. Like the zodiacal light, the gegenschein is mainly sunlight scattered by particles in interplanetary space along the ecliptic. The zodiacal light is forward scattered while the gegenschein is backscattered light.
Industry:Weather
A pendulum with precession, relative to an observer fixed to the earth, produced by the effect of Coriolis acceleration. If set swinging at the North Pole in a given plane in space, its linear momentum perpendicular to the plane is zero, and it will continue to swing in this invariable plane while the earth rotates beneath it with a period of one day. At a latitude L, the frequency of precession is 1/T sin L where T is one day.
Industry:Weather
A pole in the geomagnetic system of coordinates. Compare magnetic dipole.
Industry:Weather
A problem-solving procedure in which candidate solutions are generated from each possible goal of a knowledge-based system and evidence is then gathered to determine whether each is acceptable for the current situation. See also backward chaining.
Industry:Weather
A product issued by an NWSO (National Weather Service Office) or NWSFO (National Weather Service Forecast Office) to advise of the possibility that flooding will occur in a specified area over a period longer than six hours.
Industry:Weather
A radio wave that propagates by means of interaction with the earth's surface, as opposed to free-space or sky wave propagation. At low frequencies, ground waves can propagate thousands of kilometers following the earth's curvature.
Industry:Weather
A rating that indicates the frequency range over which an instrument will respond uniformly or within specified limits. The frequency response is an important parameter in evaluating the dynamic response of an instrument.
Industry:Weather
