- 行业: Weather
- Number of terms: 60695
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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 general, an instrument that indicates reception of an electric or electromagnetic signal. Compare transponder.
Industry:Weather
In general, an automatic feedback control system in which the controlled variable is mechanical position or any of its derivatives. In radar, it is a method for controlling the positioning of an antenna. The servo loop control system, or servomechanism, employs an alignment error voltage to command the antenna to move to a position that will reduce the alignment error to zero. The system consists of a computer, amplifiers, filters, and motors that move the antenna about its vertical and horizontal axes.
Industry:Weather
In general, an aircraft flight so planned and navigated as to take advantage of the flight-altitude winds (pressure pattern) to reduce flying time. As techniques have advanced, this concept has become increasingly referred to as minimal flight. Probably the most widely used method today is based upon the determination of D-values with pressure and radio altimeters while in flight. This provides for the continual adjustment of flight course to take fullest advantage of winds in long flights over water. Flight plans made out by the navigator are based on meteorological forecasts of wind distribution. These forecasts are usually prepared in the form of maps analyzed in terms of D-values at the flight pressure altitude. During flight, observations of actual D-values can conveniently be used to make relatively small corrections. See constant-pressure-pattern flight, aerologation, single-heading navigation, 4-D chart, wave-front method, single drift correction, multiple drift correction.
Industry:Weather
In general, a slow trend, the actual timescale implied being different for different contexts.
Industry:Weather
In general, a remote sensing device that receives electromagnetic (or acoustic) waves transmitted through, emitted by, or reflected from the atmosphere in order to produce a vertical profile of one or more atmospheric quantities. Often used more specifically to refer to a wind profiler.
Industry:Weather
In general, a climatic zone with a climate typical of the subtropics, with warm temperatures and meager precipitation.
Industry:Weather
In expert systems, the set of all possible rules, facts, and relationships as set out in the rules.
Industry:Weather
In English folklore, a period of fine, calm weather, similar to Indian summer, occurring in October. St. Luke's Day is 18 October. Compare St. Martin's summer, All-hallown summer, Old Wives' summer.
Industry:Weather
In English folklore, a period of fine, calm weather, similar to an Indian summer, occurring in November. St. Martin's Day (Martinmas) is 11 November. Compare St. Luke's summer, All-hallown summer, Old Wives' summer.
Industry:Weather
