Improved Code Sending Type Radiosonde

Abstract

We investigated various problems concerning the accuracy of the radiosonde which we designed and constructed on the principles described in our previous paper.
In temperature measurement the position of the thermometer in the ventilator of the radiosonde is important because the heating effect of solar radiation upon the wall of the ventilator affects the temperature indication of the thermometer. The optimum position does not always coincide with the position of the highest air velocity. The effect of insolation on the temperature measurement is not remarkable up to the height of tropopause. The comparison of this type of radiosonde with U. S. A. radiosonde shows that there exists no systematic deviation of observed values between them.