Models and instrumentation for monitoring the thermal behaviour of stratospheric balloons

Details Models and instrumentation for monitoring the thermal behaviour of stratospheric balloons Models and instrumentation for monitoring the thermal behaviour of stratospheric balloons

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.471..553p&link_type=abstract

In: 15th ESA Symposium on European Rocket and Balloon Programmes and Related Research, 28 - 31 May 2001, Biarritz, France. Ed.:

Physics

Balloons

Scientific paper

Models of balloons are used for designing new vehicles, pre-flight simulations and post-flight analyses. The ratio between the average lift gas temperature and air temperature plays a major role on the altitude of equilibrium of balloon. Therefore balloon thermal behavior has to be well characterized. The heat of a balloon is the result of radiation and convection with the ambient medium processes. They can be modeled with various levels of sophistication depending on the number of thermal nodes used to describe the convection. The radiative forcing can be either directly measured or simulated using in situ measuremnts or coincident satellite observations. Measurements made with a homemade pyranometer show the necessity of having well calibrated and stable instruments to measure separately solar and infrared radiation. Some results of on going studies to model the irradiances at the balloon level are given. They stress the need of knowing the actual cloudiness below the balloon and also to take into account the water vapor absorption in non arctic atmospheres. In order to validate the models, a map of envelop temperatures can be established using a thermal camera.

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