- 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 region of free electrons in the ionosphere occasionally observed above the F2-layer. The existence of this region has not been definitely established.
Industry:Weather
(German: shape or form. ) In synoptic meteorology, a complex of weather elements occurring in a familiar form, although this term is not commonly used. The complex, though not necessarily referring to basic hydrodynamical or thermodynamical quantities, may persist for an appreciable length of time and is often considered to be an entity in itself. An example of a gestalt is a warm front and its associated pattern of cloudiness and precipitation.
Industry:Weather
A radar that transmits a waveform that is continuously and regularly modulated in frequency, typically using a linear sweep or sawtooth wave for the frequency modulation. In such a radar the range to a target is determined by the frequency of the signal it returns. Extremely high range resolution can be achieved by measuring the returned signal in narrow frequency bands.
Industry:Weather
The science dealing with the form and surface configuration of the solid earth. It is primarily an attempt to reveal the complex interrelationships between the origin (and therefore material composition) of surface features on the one hand, and the causes of the surface alteration (erosion, weather, crustal upheaval, etc. ) on the other hand.
Industry:Weather
A cloud species characterized by a fine hairlike or striated composition, the filaments of which which are usually distinctly separated from each other. The extremities of these filaments are always thin and never terminated by tufts or hooks. This species is found mainly in the genera cirrus and cirrostratus. Cirrostratus fibratus may develop from cirrus fibratus or cirrus spissatus. See cloud classification.
Industry:Weather
A cloud species characterized by a fine hairlike or striated composition, the filaments of which which are usually distinctly separated from each other. The extremities of these filaments are always thin and never terminated by tufts or hooks. This species is found mainly in the genera cirrus and cirrostratus. Cirrostratus fibratus may develop from cirrus fibratus or cirrus spissatus. See cloud classification.
Industry:Weather
A period of cold weather in the middle and upper parts of the Amazon Valley and in eastern Bolivia. Such periods occur during the dry season in the Southern Hemisphere winter.
Industry:Weather
A system for the precise control of the approach and landing of aircraft by an operator on the ground. Precision approach radar is employed to view the aircraft, and the radar operator “talks” the pilot down by giving him his position and suggested corrections for maintaining the “perfect approach. ” Currently, GCA is a required facility at an all-weather airport. If perfectly operated, this system would ensure safe landing under zero ceiling and visibility conditions; however, to provide a safety factor, GCA minimums are prescribed at nearly all installations.
Industry:Weather
(Chinese for “wind and cloud. ”) A geostationary meteorological satellite launched by China and stationed over the Indian Ocean at 105°E longitude. After a successful launch on 10 June 1997 the satellite began regular operations late in 1997. Multi-spectral imagery is provided by a modified version of the VISSR instrument, very similar to those used on the GMS satellites. In early 1998 the satellite encountered difficulties with its data link. A separate series of Chinese polar orbiting satellites have also used the Fengyun name (Fengyun 1A and 1B).
Industry:Weather
A period of cold weather in the middle and upper parts of the Amazon Valley and in eastern Bolivia. Such periods occur during the dry season in the Southern Hemisphere winter.
Industry:Weather
