An instrument used to measure the water vapor content of the air. A type of hygrometer. It consists of a wet-bulb and a dry-bulb thermometer. See aspiration psychrometer, Assmann psychrometer. hygrodeik, sling psychrometer.

A radiosonde equipped to measure temperature only.

A relatively small-scale, downward moving current of air.

A type of photoelectric photometer used to measure high-altitude winds on the assumption that stellar scintillation is caused by atmospheric inhomogeneities being carried along by wind near the tropopause level.

Physical equipment used in data processing. Compare to firmware, software.

A protective coating applied to circuits.

The energy of any type of electromagnetic radiation. Also called radiation.

A large plastic constant-level balloon for duration flying at very high altitudes.

Operation mode of a communication circuit in which one end can only transmit and the other end can only receive.

Same as balloon cover.

Difference between the instantaneous wind velocity at a point and the mean wind velocity taken over a given time interval. Also called fluctuation velocity.

Precipitation falling from a cloud, usually in wisps or streaks, but evaporating before it reaches the ground.

A measure, proposed by Angstrom, of the precipitation effectiveness of a region.

A wind scale adapted by the U.S. Forest Service for use in the forested areas of the northern Rocky Mountains (NRM). It is an adaptation of the Beaufort wind scale. The difference between these two scales lies in the specification of the visual effects of ...

An early and once universal name for the mercury barometer.

An anemometer which derives wind speed from measurements of dynamic wind pressures. Wind blowing into a tube develops a pressure greater than the static pressure, while wind blowing across a tube develops a pressure less than the static. This pressure dif ...

See feed.

Rate of wind movement in distance per unit time.

The decrease of an atmospheric variable with height, the variable being temperature, unless otherwise specified.

A small anemometer with flat vanes which indicates the number of linear feet or meters of air which have passed the instrument during its exposure.