عنوان مقاله [English]
Colliding high energy cosmic rays to the earth atmosphere produces secondary particles which generate extensive air shower (EAS) that develops in lateral and longitudinal directions. It was found that electron density in two directions is related to the age parameter. Dai et. al.  clarified the difference between the lateral and longitudinal age parameters in 1990. However, some scientists believe that the lateral age parameter from NKG model is not sufficient to describe the electro lateral dispersion. In the current study, given the experimental and simulation data and also given the results of Dai et. al. work, the dependence of the lateral and longitudinal age parameter to core distance is investigated. Finally, contrary to NKG theory, at Linsley theory, the age parameter is not a constant parameter, so it increases with an increase in core distance.
 K. Kamata, J .Nishimura, The Lateral and the Angular Structure Functions of Electron Showers, Progress of theoretical physics, 6 (1958) 93-155.