Meteorology

Meteorology

A database of terms pertaining to the scientific study of the atmosphere.

Industry: Weather

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Meteorology

noise level

Weather; Meteorology

Roughly, the amount of noise power in a signal. The noise level is a limit where simple power measurements start to have trouble measuring the signal.

noise figure

Weather; Meteorology

A number by which the performance of a radio receiver can be specified. Essentially, the noise figure is the ratio of the noise generated by the actual receiver to the noise output of an “ideal” ...

luminous clouds

Weather; Meteorology

Thin silvery-blue cirrus-like clouds frequently seen during summer twilight conditions at high latitudes (above 50°) in both hemispheres. They are the highest visible clouds in the atmosphere, ...

1. Any function, often of time but possibly of any variable, with a substantial lack of correlation between values at successive times. For example, the autocorrelation function of white noise is a ...

node

Weather; Meteorology

One of the two points of intersection of the orbit of a satellite with the plane of the equator of the earth. The ascending node of equatorial crossing refers to that point on the plane of the ...

nodal period

Weather; Meteorology

The time that elapses between successive passages of a satellite through successive ascending nodes.

nodal increment

Weather; Meteorology

The difference in degrees longitude between successive ascending nodes of a satellite in polar orbit. It is the amount of turning of the earth under the satellite, measured in degrees longitude, that ...