pilot balloon observation
- pilot balloon observation
-
A method of winds-aloft
observation,
temperature,
and relative humidity of the upper that is, the
determination of wind speeds and air and to automatically transmit that directions in the atmosphere above a station. This is done by reading the elevation and azimuth angles of a theodolite (
instrument) observation while visually tracking a pilot balloon. The ascension rate of the balloon is approximately determined by careful
inflation to a given total
lift. After release from the ground, periodic readings (usually at one-minute intervals) of elevation and azimuth angles of the balloon are recorded. These data are transferred to a winds-aloft plotting board, and
wind speed and
direction at selected levels are
calculated by
trigonometric methods.
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Look at other dictionaries:
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