Difference between revisions of "Radiosonde"

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== radiosonde ==
 
== radiosonde ==
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<div class="definition"><div class="short_definition">An expendable [[meteorological instrument]] package, often borne aloft by a free-flight  [[balloon]], that measures, from the surface to the [[stratosphere]], the vertical profiles of atmospheric  variables and transmits the data via radio to a ground receiving system.</div><br/> <div class="paragraph">Radiosondes typically measure [[temperature]], [[humidity]], and, in many cases, [[pressure]]. Radiosonde  temperature sensors generally measure temperature-induced changes in the electrical [[resistance]], capacitance, or voltage of a material. Radiosonde humidity sensors can be substances that  respond in a known way to changes in ambient humidity or instruments that directly measure a  characteristic of the air that is dependent on its [[water vapor]] content. Radiosonde pressure sensors  are typically [[aneroid]] cells, a part of which flexes in proportion to pressure changes. Some radiosondes do not measure pressure, but pressure data are calculated from the [[hypsometric equation]] using temperature, humidity, and height data. Some radiosondes also measure [[wind speed]] and [[wind direction|direction]]. <br/>''See'' [[rawinsonde]].</div><br/> </div>
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<div class="definition"><div class="short_definition">A meteorological instrument that is carried aloft by a large [[balloon]] to measure [[temperature]], [[humidity]], and [[pressure]] and transmit the data back to a ground receiving system. A radiosonde instrument (sometimes abbreviated to just "sonde") that is equipped to be tracked by [[radar]] via [[radio direction finding]], or [[navigation]] systems (such as the [[global positioning system]]) to obtain [[wind speed]] and [[wind direction]] data is referred to as a [[rawinsonde]].</div><br/>
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<div class="paragraph">The radiosonde temperature sensor is a [[thermistor]], the humidity sensor is a [[hygristor]], and the pressure sensor is an [[aneroid capsule]]. Some radiosondes do not measure pressure, but pressure data are calculated from the [[hypsometric equation]] using temperature, humidity, and height data. The data collected from radiosonde observing systems produce temperature, humidity, and wind speed and direction [[profile|profiles]] as a function of height, pressure, and location. Location is important because the instrument is carried by the [[wind]] as it rises. In some cases, data are collected both during the ascent and decent of the instrument. The complete [[sounding]] is frequently referred to as a [[RAOB]], an acronym for [[radiosonde observation]].</div><br/>
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<div class="paragraph">The radiosonde balloon carries the instrument to about 30&#8201;000 m (100&#8201;000 ft) where the balloon bursts and the instrument parachutes to Earth. Roughly 20% of the instruments are recovered and refurbished.<br/>
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''See also'' [[dropsonde]].
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''Compare'' [[rawinsonde]], [[Raob|RAOB]].</div><br/></div>
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<p>''Term edited 30 December 2021.''</p>
  
 
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Revision as of 07:30, 30 December 2021



radiosonde

A meteorological instrument that is carried aloft by a large balloon to measure temperature, humidity, and pressure and transmit the data back to a ground receiving system. A radiosonde instrument (sometimes abbreviated to just "sonde") that is equipped to be tracked by radar via radio direction finding, or navigation systems (such as the global positioning system) to obtain wind speed and wind direction data is referred to as a rawinsonde.

The radiosonde temperature sensor is a thermistor, the humidity sensor is a hygristor, and the pressure sensor is an aneroid capsule. Some radiosondes do not measure pressure, but pressure data are calculated from the hypsometric equation using temperature, humidity, and height data. The data collected from radiosonde observing systems produce temperature, humidity, and wind speed and direction profiles as a function of height, pressure, and location. Location is important because the instrument is carried by the wind as it rises. In some cases, data are collected both during the ascent and decent of the instrument. The complete sounding is frequently referred to as a RAOB, an acronym for radiosonde observation.

The radiosonde balloon carries the instrument to about 30 000 m (100 000 ft) where the balloon bursts and the instrument parachutes to Earth. Roughly 20% of the instruments are recovered and refurbished.

See also dropsonde.

Compare rawinsonde, RAOB.

Term edited 30 December 2021.