- 行业: Weather
- Number of terms: 60695
- Number of blossaries: 0
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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 radar, the time between successive; the reciprocal of the pulse repetition frequency.
Industry:Weather
Chromatographic technique similar to gas chromatography, except that various individual solvents, combinations of solvents, and changing concentrations of solvent are used in combination with stationary column phases to separate components of a liquid matrix. Various detectors are used in HPLC, including UV (fixed and variable wavelength), refractive index, and conductivity detectors.
Industry:Weather
Any of several devices for counting atmospheric particles that serve as heterogeneous ice nuclei that are suited by composition to catalyze the formation of ice crystals in the atmosphere. The devices operate on varied principles, include means to cool and moisturize the air within a chamber or over a nucleus-collection filter, and are intended to measure the number concentration of ice nuclei that form ice crystals as a function of temperatures that would occur in subzero tropospheric clouds (thus, 0° to near −40°C). The product is the nucleation activity temperature spectrum. Some, but by no means all, types of ice nuclei counters are designed to attempt to replicate supersaturations that occur where ice crystals form in natural tropospheric clouds.
Industry:Weather
The magnetic field found far from any bodies of the solar system.
Industry:Weather
A navigational aid used to facilitate the landing of an aircraft in instrument weather at an airport. The instrument landing system consists of two parts: 1) a directional guide to bring the plane to the correct runway; and 2) a glide path to bring the plane down at the correct glide angle or slope to touch the runway at the correct point. Current safety requirements demand that visual contact with the ground be possible within the final several hundred feet of descent.
Industry:Weather
A geomagnetic field defined by a mathematical formula and believed to be the best analytical description of the complete geomagnetic field. This formula includes a series of spherical harmonic terms, each of which has a coefficient that determines the strength of that term. Since the geomagnetic field changes with time, these coefficients are upgraded every five years by a committee of the International Association of Geomagnetism and Aeronomy. The IGRF is thought to represent the geomagnetic field due to deep earth processes. It does not include wavelengths shorter than a few thousand kilometers since these are thought to be due to crustal magnetization rather than deep earth processes. Accordingly the value of the geomagnetic field measured at a location may differ somewhat from that given by the IGRF.
Industry:Weather
A set of regulations set down by the U. S. Civil Aeronautics Board (in Civil Air Regulations) to govern the operational control of aircraft on instrument flight. IFR is seldom used to denote the rules themselves, but is in popular use to describe the weather and/or flight conditions to which these rules apply.
Industry:Weather
A layer within the atmosphere bounded below by the surface, and above by a more or less sharp discontinuity in some atmospheric property. Internal boundary layers are associated with the horizontal advection of air across a discontinuity in some property of the surface (e.g., aerodynamic roughness length or surface heat flux) and can be viewed as layers in which the atmosphere is adjusting to new surface properties. See thermal internal boundary layer, mechanical internal boundary layer.
Industry:Weather
An internationally recognized code for communicating details of synoptic chart analyses.
Industry:Weather
The airspeed read or recorded directly from an airspeed indicator. Indicated airspeed is usually lower than the actual airspeed and must be corrected for both temperature and density to yield true airspeed. The correction is quickly accomplished on an ordinary navigational computer.
Industry:Weather
