In radiometry, a measure of the intrinsic radiant intensity emitted by a radiator in a given direction.

Any meteorological instrument, such as a radiosonde, in which the recording apparatus is located at some distance from the measuring apparatus.

Water vapor content of the air. See absolute humidity, dew point, mixing ratio, relative humidity, specific humidity.

A sudden, significant increase in station pressure.

The distance or length of flow of the air past a point during a given interval of time.

The condition of the atmosphere when the amount of water vapor present is the maximum possible at the existing temperature.

The audio-frequency signal transmitted by the Diamond-Hinman radiosonde when the baroswitch pen passes each fifteenth contact of the commutator, up to a number determined by the design of the commutator, and each fifth contact thereafter. This signal is t ...

Situated on the side from which the wind blows.

In a system of moist air, the dimensionless ratio of the mass of water vapor to the total mass of the system.

Same as an upper air observation, but commonly used to refer to a single complete radiosonde observation.

An instrument that automatically records pressure and temperature.

An instrument for measuring the intensity of direct solar radiation at normal incidence. See Angstrom compensation pyrheliometer, Eppley pyrheliometer, Michaelson actinograph. silver- disc pyrheliometer, spectropyrheliometer, waterflow pyrheliometer.

Any source of radiant energy, especially electromagnetic energy.

Name sometimes given to a transmissometer.

An evaluation of upper air temperature, pressure, and humidity from radio signals received from a balloon- borne radiosonde.

A large body of air having similar horizontal temperature and moisture characteristics.

Transmitted energy which is modulated in order to carry information. Usually, it is in the form of a radio- frequency sine wave, modulated either in amplitude or in frequency.

A type of climatic diagram whose coordinates are some form of temperature vs. a form of humidity or precipitation.

The group of bits which a computer processes as a unit; often, 8 bits.

Diffuse solar radiation which has the same intensity in all directions.