Thermal analysis of SUNRISE III ascent phase

SUNRISE III is a Solar telescope designed to operate at the Stratosphere (around 37 km). To reach this altitude, it is mounted on a Long Duration Balloon (LDB). From the thermal point of view, during the ascent phase when the telescope is ascending to the float altitude, the cold case of the mission can be reached due to the combination of high wind speeds and low air temperature convective effects at the tropopause. Besides, during this phase, the properties that defines the thermal environment change with the altitude, and are extremely dependent of the launch site, the epoch and the launch time. Hence, in order to simulate this phase, firstly, a tool using Python has been developed that defines the thermal environment simulating the dynamic of the balloon ascent motion and, secondly, using the outputs of this tool, the thermal analysis of the ascent phase of SUNRISE III has been implemented in ESATAN-TMS.