The invention relates to a stratospheric balloon comprising on the one hand an external flexible envelope (1) having a natural shape and made of transparent synthetic material and presenting an air inlet and, on the other hand, an internal screen (2) made of visible and infrared energy collecting material and having the shape of a surface generated by a mobile generatrix parallel to the longitudinal symetry axis of the external envelope, said internal shield being connected to the envelope (1) by attaching means arranged at the upper part of said envelope at a distance from the longitudinal axis of the latter, and extending longitudinally freely inside the envelope (1) without contacting it.
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