![]() The possibilities of making use of the globe-circling rivers of air were not obvious at first. The decades rolled past while aviation developed ever more capable aircraft. Japanese meteorologists in the 1920’s used pilot balloons to observe the winds high aloft - but they wrote up their reports in Esperanto, and the observations stayed in Japan. Scattered observations over time suggested that there were high winds in the upper atmosphere, even before the age of powered flight, such as those made of volcanic ash and smoke clouds that drifted eastward after the 1883 eruption of Krakatoa in Indonesia. A different kind of wind was waiting in the stratosphere, while aviation kept pushing the envelope towards higher flight levels.
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