An instrument for photographing the corona and prominences of the sun at times other than at solar eclipse.

In folklore, a name for rain.

A protective coating applied to circuits.

An instrument, located at the surface observing station, which is used to record the data presented by a radiosonde aloft.

A device attached to a meteorological instrument to provide ventilation; usually a suction fan.

In meteorology, a deflecting force acting on a body in motion and resulting from the earth's rotation. It deflects air currents to the right in the northern hemisphere and to the left in the southern hemisphere, thus having an effect on wind direction.

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

A clockwise change in wind direction. Veering winds with height are indicative of warm air advection (WAA).

A barometer which measures atmospheric pressure using one or a series of aneroid capsules. Also called holosteric barometer.

The record obtained from a bolometer.

A reversing thermometer (for seawater temperature) which is not protected against hydrostatic pressure. The mercury bulb is therefore squeezed, and the amount of mercury broken off on reversal is a function of both temperature and of hydrostatic pressure.

A numbering system using a base number of 2 and having only two digits: 0 and 1. The fundamental system of representing information with electrical pulses.

Central Processing Unit. The part of a computer which controls and directs all functions.

An instrument whose calibration is determined by comparison with an absolute instrument.

The effect upon the measurement of rainfall caused by the presence of the rain gauge.

Infrared radiation emitted by or being propagated through the atmosphere.

An instrument for the measurement of both solar and terrestrial radiation.

The value of atmospheric pressure to which the scale of a pressure altimeter is set so as to indicate airport elevation. The altimeter setting is included as part of an aviation weather observation.

The correction applied to an instrument to account for the effect of temperature upon its response characteristics.

A small balloon, loaded with ballast and inflated so that it will explode at a predetermined altitude, which is attached to a larger balloon.