TUNGUSKA99 Expedition

Position in geographic coordinates of the airplane (left) and altitude (right) during the flight Forli- Moscow- Krasnoyarsk-Moscow- Forli. Open circles: Forli-Krasnoyarsk; dots: return (See paper, 67 kb). The attenuation of the cosmic gamma-ray flux, in the 3-10 MeV energy range, measured during this flight is in agreement with our previous measurements at the Everest-K2 Laboratory (5050 m a. s. l) and the ones measured in Italy at 2050 m, 970 m and 50 m a. s. l. (Proc. 25-th International Cosmic Ray Conference, Salt Lake City, 1999, vol. 7, pp. 355-358).

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