DAYCOR users manual

The DAYton temperature CORrection model (DAYCOR) calculates the temperature correction that must be applied to the temperature measured by the VIZ radiosonde`s white rod thermistor to deduce the atmospheric temperature. The temperature correction calculation takes into account all the significant heat transfer processes that influence the temperature of the rod thermistor. These processes include the convective heat transfer with the air, the solar and infrared radiation absorbed by the thermistor, the radiation emitted by the thermistor, and the heat conducted to the thermistor through the lead wires. The DAYCOR model ignores the influence, on the thermistor, of reflected and emitted radiation from the balloon and radiosonde instrument. Luers`(1989) shows these influences to contribute less than 10% to the temperature correction. The heating of the thermistor from the electric current passing through the circuit is small and is also neglected in the model calculations