Abstract
Some samples of stratospheric gamma ray families have been simulated with CORSIKA and compared to the remarkable event JF2af2 obtained during an exposure of emulsion chambers on the Concorde near 10 7 GeV. CORSIKA has been especially adapted according to X-ray emulsion chamber measurements and aligned events are selected by a least square fit method to one straight line. After comparing the characteristics of alignments and gamma's energetic distributions, for different situations, (diffractive component or on opposite non diffractive component with large multiplicities), it is shown that the coincidence of particular topology of the primary interaction and favorable geometric incidence gives a probability of 1 – 3% to observe alignments from normal multiple production. In such case, there is a characteristic gap between one of the most energetic gammas and the others and the probability to observe co-planar emission would be increasing with zenith angle. Events with such common features from simulation and experiment are shown.
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