pilot balloon

Japanese: pilot balloon(英語表記)pilotballoon
pilot balloon

...the most common use is in meteorological observations, such as observing upper-level winds. Such balloons are called pilot balloons or anemometry balloons. For observations, small balloons (e.g. 60 g) are usually filled with hydrogen to give them buoyancy so that they can rise at a given speed.

*Some of the terminology that mentions "pilot balloon" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…最も広く行われるのは上層風の観測など,気象観測の分野である。この気球はパイボール(pilot balloonの略)あるいは測風気球と呼ばれる。観測にあたっては,通常,小型の気球(たとえば60g)に水素を充てんし,所定の上昇速度が得られるように浮力を与える。…

※「pilot balloon」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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