Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-08-14
Astropart.Phys.16:1-11,2001
Astronomy and Astrophysics
Astrophysics
27 pages including 9 figures in revtex4 epsf style, submited to Astroparticle Phys
Scientific paper
10.1016/S0927-6505(00)00170-5
The average extensive air shower longitudinal development profile as a function of shower age in the energy range from 10$^{17}$ to 10$^{18}$eV is measured using data from the hybrid HiRes/MIA experiment. An angular bin signal based Cerenkov light component subtraction method and a shower maximum fitting method using a local parabolic function are used to correct and normalize the data. The Gaisser-Hillas and Greisen functions work equally well for describing the shower profile. The Gaussian function is a poor fit. A simple scale-free function is proposed and fits the data equally well. The best-fit parameters for the above functions are determined.
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