A contact anemometer connected to an electrical circuit which is so arranged that the average wind speed is indicated.

Amount of solar radiation incident, per unit area and time, on a surface which is perpendicular to the radiation and is situated at the outer limit of the atmosphere, the earth being at its mean distance from the sun. It equals approximately 2.00 ly/ min ...

Anemometer whicb measures wind speed by measuring the degree of cooling of a metal wire heated by an electric current. A type of cooling power anemometer.

Random Access Memory. The memory of a computer which can be read and written into at any location without passing through preceding locations.

A faintly-colored circular arc similar to a rainbow but formed on fog layers containing drops whose diameters are 100 microns or less. Also called mistbow, white rainbow.

A rocket designed primarily for routine upper air observations in the lower 250,000 feet of the atmosphere, especially that portion inaccessible to balloons (above 100,000 feet).

A self-recording psychrometer.

A common type of terrestrial scintillation; shimmering over a hot surface (such as a roadway) on a quiet, cloudless. summer day.

Automated Weather Observing Station. A self-contained weather station designed to make aviation weather observations without operator involvement.

A photoelectric spectrophotometer which is used in the determination of the ozone content of the atmosphere.

A numbering system using a base number of 16 and including the ten decimal digits (0 to 9) along with six alpha digits (A to F). Thus. a digit is available to represent each of the possible values of a 4-bit binary digit.

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

To free something from the binding action of ice by warming it to a temperature above the melting point of ice. Also, a warm spell when ice and snow melt.

A device for measuring the height of tide. It may be simply a graduated staff in a sheltered location where visual observations can be made, or it may consist of an elaborate recording instrument (sometimes called a marigraph) making a continuous graphic ...

The total of all deviations of a transducer's output from a specified straight line in a constant environment.

The value of the quantity measured, as indicated or otherwise provided by a measuring instrument.

Atmospheric layer throughout which there is no change of temperature with height, i.e. a zero lapse rate.

A radiosonde which is dropped by parachute from an aircraft for the purpose of obtaining soundings of the atmosphere below.

A graphical aid used in the reduction of data from a winds aloft observation.

The frequency of a carrier wave.