About the necessity of new small EAS experiments at observation levels 500–600 g cm-2

New small EAS experiments at observation levels 500–600 g cm-2 devoted to investigation of the primary mass composition and energy spectrum at energies 104–105 GeV are necessary to carry calibration between the direct (balloons and satellites) and indirect (EAS) methods for primary cosmic flux studies. A new shower selection has to be used in the attempt to obtain the possibility to apply compact EAS arrays for unbiased primary mass composition and energy spectrum estimations

New possibilities for the Chacaltaya array

This document presents some possibilities which could be applied to the new Chacaltaya experiment mainly on the calibration of this experiment on the ground with direct measurements from satellites or balloons, to select showers generated by primaries with different masses but with the same energy, to obtain an unbiased determination of the primary mass composition around the knee for given energies and to select gamma showers for very high energies