The high-altitude radiosonde observations using a 3,000-gram balloon are conducted by releasing the balloon shortly before sunset. The balloon receives solar radiation in the troposphere and can pass through the low temperature of -80°C or lower at the tropopause and reaches the stratosphere.
In the stratosphere after sunset, the balloon measures the temperature without being affected by solar radiation and steadily reaches an altitude of 40 km. Currently, we are improving the system by devising a way to obtain more stable data.
(SO・TK・RS)
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