- Industry: Weather
- Number of terms: 60695
- Number of blossaries: 0
- Company Profile:
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, ...
An electronic instrument used for the detection and ranging of distant objects of such composition that they scatter or reflect radio energy. A radar consists of a transmitter, receiver, antenna, display, and associated equipment for control and signal processing. The most common radars are monostatic radars, which use the same antenna for both transmission and reception. These radars depend on backscattering to produce a detectable echo from a target. Bistatic radars have the transmitter and its antenna at one location and the receiver and its antenna at a remote location. These radars depend upon forward scattering to produce a detectable signal. Radio energy emitted by the transmitter and focused by the antenna of a monostatic radar propagates outward through the atmosphere in a narrow beam. Objects lying in the path of the beam reflect, scatter, and absorb the energy. A small portion of the reflected and scattered energy, called the target signal, travels back along the same path through the atmosphere and is intercepted by the receiving antenna. The time delay between the transmitted signal and the target signal is used to determine the distance or slant range of the target from the radar. The direction in which the focused beam is pointing at the instant the target signal is received (i. E. , the azimuth and elevation angles of the antenna) determine the direction and height of the target. This information is presented visually as echoes on different types of radar displays. Because hydrometeors scatter radio energy, weather radars, operating in certain radar frequency bands, can detect the presence of precipitation and other weather phenomena at distances up to several hundred kilometers from the radar, depending upon meteorological conditions and the type of radar. MST radars and wind profilers, which operate at longer wavelengths than weather radars, are able to detect echoes from optically clear air that are caused by spatial fluctuations of refractivity. Additional information provided by a radar about a target may include the radial velocity or rate of change of range, as measured by a Doppler radar, or the depolarizing characteristics of the target, as measured by a polarimetric radar.
Industry:Weather
主虹のすぐ内側頻繁に見ることができます罰金の弱着色された弓のシリーズ。雨シャワーで形成されるときドロップ サイズの広範な分布があるこれらの弓はレインボー アーチの上部にある主に見られているがプライマリ弓の垂直部分に向かってフェードします。彼らは虹の説明に基づいてされる光の治療光線のシリーズは彼らのための会計のことができるという事実に （所定数) を超えて自分の名前を借りています。ただし、光が波として扱われる、過剰弓高次干渉マキシマ、先がプライマリの弓は最初の最大値になります。この意味では過剰の弓は、プライマリの一部ボーと言う、その色です。
Industry:Weather
主虹のすぐ内側頻繁に見ることができます罰金の弱着色された弓のシリーズ。雨シャワーで形成されるときドロップ サイズの広範な分布があるこれらの弓はレインボー アーチの上部にある主に見られているがプライマリ弓の垂直部分に向かってフェードします。彼らは虹の説明に基づいてされる光の治療光線のシリーズは彼らのための会計のことができるという事実に （所定数) を超えて自分の名前を借りています。ただし、光が波として扱われる、過剰弓高次干渉マキシマ、先がプライマリの弓は最初の最大値になります。この意味では過剰の弓は、プライマリの一部ボーと言う、その色です。
Industry:Weather
三方が通常六角形対称と 2 と同じくらい 100 よりも大きなアスペクト比を持つ氷の結晶 （3 倍） と他の対称性時折発生します。このような結晶に形成する雲の切れ間から落ちる、彼らは樹状突起の拡張機能を開発、平面樹枝状結晶になるそれらの原因な状況が発生します。
Industry:Weather
