Thursday, June 3, 2021
Since May 27, we have been conducting high-altitude radiosonde observations using a very large 3000g balloon (normally 350-600g) once a day. The purpose of these observations is to observe from the ground to an altitude of around 40 km, and to investigate atmospheric disturbance activities that exist at altitudes above 30 km. When measuring temperatures with the radiosonde, we have been launching at night because we need to correct for solar radiation during the daytime. However, many balloons burst at an altitude of around 20 km. One possible cause is that the balloon cannot withstand the low temperature region at the tropopause.
Then, we launched it during the daytime when sunlight was available, and were able to observe up to 39.8 km. At present, we are planning to launch the balloon near sunset in the upper tropopause, and at night in the stratosphere. We will continue our observations through trial and error.
(SO・TK)
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