Pilot-balloon observation: Difference between revisions
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<div class="definition"><div class="short_definition">(Commonly contracted pibal.) A method of [[winds-aloft observation]], that is, the determination of [[wind]] speeds and directions in the [[atmosphere]] above a [[station]].</div><br/> <div class="paragraph">This is done by reading the [[elevation]] and [[azimuth]] angles of a [[theodolite]] 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 the wind speed and direction at selected levels are calculated by trigonometric methods. <br/>''See'' [[graphing board]], [[winds-aloft plotting board]]; <br/>''compare'' [[rabal]], [[rawin]], [[rawinsonde]], [[double-theodolite observation]].</div><br/> </div> | <div class="definition"><div class="short_definition">(Commonly contracted pibal.) A method of [[winds-aloft observation]], that is, the determination of [[wind]] speeds and directions in the [[atmosphere]] above a [[station]].</div><br/> <div class="paragraph">This is done by reading the [[elevation]] and [[azimuth]] angles of a [[theodolite]] 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|winds- aloft plotting board]], and the wind speed and direction at selected levels are calculated by trigonometric methods. <br/>''See'' [[graphing board]], [[winds-aloft plotting board]]; <br/>''compare'' [[rabal]], [[rawin]], [[rawinsonde]], [[double-theodolite observation]].</div><br/> </div> | ||
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Latest revision as of 16:36, 25 April 2012
pilot-balloon observation
(Commonly contracted pibal.) A method of winds-aloft observation, that is, the determination of wind speeds and directions in the atmosphere above a station.
This is done by reading the elevation and azimuth angles of a theodolite 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 the wind speed and direction at selected levels are calculated by trigonometric methods.
See graphing board, winds-aloft plotting board;
compare rabal, rawin, rawinsonde, double-theodolite observation.
See graphing board, winds-aloft plotting board;
compare rabal, rawin, rawinsonde, double-theodolite observation.
