Abstract
There are several reference and standard atmosphere models which are claimed to be valid and accurate for different regions all over the world. Launchers, during their atmospheric flight, exposed to aerodynamic drag forces. Magnitude of these forces and trajectories of the launchers directly depend on the atmospheric conditions. It is a must to model the atmosphere accurately before the trajectory analysis in order to determine the trajectory of the vehicle precisely. Since there are no detailed atmospheric studies related to Turkey, which include atmospheric properties at high altitudes above 30 km, it is required to investigate the effect of regional and seasonal changes on a possible trajectory of launch from territory of Turkey. In this study, effect of different atmospheric conditions on the altitude and range of a vehicle is investigated. Study was performed using the real atmospheric values obtained from sounding balloon measurements and different models for higher altitudes that are not covered by the measurements. Two different locations are inspected regarding the change in atmospheric properties and one of these locations is more deeply investigated to clarify the effect of seasonal changes on a hypothetical launch of a suborbital launch vehicle. Main variable for the investigation is the atmospheric temperature over the investigated region at a certain time of year with respect to elevation.
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