The acceptance of the HiSPARC experiment
  Cosmic ray primary particles initiate extended air showers (EAS) in the atmosphere. The directions of these cosmic rays approximate a homogeneous isotropic distribution. The HiSPARC experiment, consisting of a growing number of measurement stations scattered over the Netherlands, Denmark and the United Kingdom, detects EAS particles using scintillators. These detections facilitate reconstructions of the direction of cosmic ray primaries.   The acceptance of the HiSPARC experiment, limited due to the generating mechanism of EASs in the atmosphere and the location of the measurement stations, has been analysed. 
N.G. Schultheiss
astro-ph.IM