- Industry: 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, ...
The length of one minute of arc along any great circle on the earth's surface. Since this actual distance varies slightly with latitude, a nautical mile by international agreement is defined as 1852 meters (6076. 103 feet or 1. 1508 statute miles). Compare mile.
Industry:Weather
The process or condition in which radiation travels between source and receiver via more than one propagation path. Because there can be only one “direct” path, some process of reflection, refraction, or scattering must account for multipath propagation.
Industry:Weather
A system for expressing distance, speed, and acceleration in which 1) the distance of one minute of arc along a meridian or great circle is one nautical mile; 2) a nautical mile per hour is a knot; 3) a nautical mile per hour per hour is the acceleration in knots per hour. Although the nautical system originated with marine operations, it has been adopted to report winds and aircraft speeds.
Industry:Weather
The twilight stage during which the sun's unrefracted center is at elevation angles −6° > ''h''<sub>0</sub> > −12°. During a clear evening's nautical twilight, horizontal illuminance decreases from ∼3. 5–2 lux to ∼0. 008 lux. At nautical twilight's bright upper limit, the brightest stars are visible and the (ocean) horizon is distinct. At its dark lower limit, the horizon is generally invisible.
Industry:Weather
データの完全な評価が上層大気観測から派生した雰囲気の中でいくつかの圧力一定レベルのいずれかが必要です。現在必須圧力レベルは 1000 mb、850 mb、700 mb、500 mb、400 mb、300 メガバイト、200 メガバイト、150 mb、100 mb、50 mb、30 mb、20 mb、10 mb、7 mb、5 mb、3 mb、2 mb と 1 mb。ラジオゾンデ コードが特定のブロックがこれらのデータのために予約されています。完全な垂直画像にラジオゾンデ観測の重要なレベルも評価されます。第二次世界大戦直後まで必須レベルが海面上の高さの値によって定義されます。
Industry:Weather
An analysis that is free from any direct subjective influences resulting from human experience, interpretation, or bias. See objective forecast.
Industry:Weather
恒星のシンチレーションは大気不均一性 (シュリーレン) 対流圏界面準位近傍風によってずっと運ばれることによって引き起こされることを前提に高高度の風を決定するメソッドで使用される光電光度計のタイプ。1 つのデザインで、星は 4 インチ長い回転スリットを通して見える単一の望遠鏡で観察されます。周波数が監視されている 2 つのシンチレーション、1 高、1 つの低。スリットは高周波と低周波シンチレーションの率が最低になるまで回転します。この時点で、スリットは平行風に。周波数比の大きさは、風の速度の関数です。別のデザインで 4 インチ離れてマウントされている 2 つの望遠鏡は星に焦点を当てています。1 つだけの周波数を監視する必要があります。位相関係の直接観察による望遠鏡は相互の軸について回転方向と速度を確定できるより少ないあい昧性および単一の望遠鏡のタイプよりも不確実性。
Industry:Weather
A type of photoelectric photometer used in a method of determining high-altitude winds on the assumption that stellar scintillation is caused by atmospheric inhomogeneities (schlieren) being carried along by the wind near tropopause level. In one design a star is observed with a single telescope that looks through a four-inch long rotatable slit. Two scintillation frequencies are monitored, one high and one low. The slit is rotated until the ratio of high-frequency to low-frequency scintillation is a minimum. At this point, the slit is oriented parallel to the wind. The magnitude of the frequency ratio is a function of the wind speed. In another design, two telescopes mounted four inches apart are focused on a star. Only one frequency need be monitored. By direct observation of phase relationships as the telescopes are rotated about a mutual axis, both direction and speed can be determined with less ambiguity and uncertainty than with the single telescope type.
Industry:Weather
A signal that consists of several distinguishable components. A multivariate signal may contain information that describes both the temporal and spatial variability of a single physical quantity.
Industry:Weather
