- 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, ...
A long-wave trough in the large-scale pressure pattern of the upper troposphere.
Industry:Weather
A long-wave ridge in the large-scale pressure pattern of the upper troposphere.
Industry:Weather
The lobe in the radiation pattern of a directional antenna that includes the region of the maximum radiated power. The center of the main lobe defines the beam axis. The beamwidth in a given plane is usually defined as the angle within which the radiated intensity is at least one-half the intensity in the direction of the beam axis. See antenna pattern.
Industry:Weather
The primary means of electronic data transmission between important processing locations; usually applied in a telecommunications system where there are major processing and assimilation locations that have smaller, less capable, or more restricted communications networks providing data to them. These smaller networks are secondary or local telecommunications networks.
Industry:Weather
Synoptic hour when meteorological stations make surface synoptic observations that are broadcast on a regional or worldwide scale. The main standard times are 0000, 0600, 1200, and 1800 UTC.
Industry:Weather
An office that provides meteorological service for international air navigation in accordance with International Civil Aviation Organization specifications. MMOs 1) prepare forecasts; 2) supply meteorological information and briefings to aeronautical personnel; 3) supply meteorological information required by an associated dependent meteorological office or supplementary meteorological office. See also meteorological watch office.
Industry:Weather
The study of the behavior of an electrically conducting fluid in the presence of a magnetic field.
Industry:Weather
Motion induced in the plasma of the outer magnetosphere by interaction with the solar wind. Magnetospheric convection in turn induces motions in the high-latitude ionosphere through linkage along the direction of the geomagnetic field.
Industry:Weather
A self-excited oscillator used as a radar transmitter tube. Magnetrons are characterized by high peak power, small size, efficient operation, and low operating voltage. Emitted electrons interact with an electric field and a strong magnetic field to generate microwave energy. Because the direction of the electric field that accelerates the electron beam is perpendicular to the axis of the magnetic field, magnetrons are sometimes referred to as crossed-field tubes. Unlike a klystron, a magnetron is not a coherent transmission source, but has a randomly changing phase from pulse to pulse. A coaxial magnetron uses a different architecture and has better stability, higher reliability, and longer life. Magnetrons are used in inexpensive radars and microwave ovens. Compare klystron.
Industry:Weather
