Based on data and Monte-Carlo simulations of the HEGRA IACT system , improved analysis techniques were developed for the determination of the shower geometry and shower energy from the multiple Cherenkov images. These techniques allow, e.g., to select subsamples of events with better than 3' angular resolution, which are used to limit the rms radius of the VHE emission region of the Crab Nebula...

Frequency distributions of local muon densities in high-energy extensive air-showers (EAS) are presented as signature of the primary cosmic ray energy spectrum in the knee region. Together with the gross shower variables like shower core position, angle of incidence, and the shower sizes, the KASCADE experiment is able to measure local muon densities for two different muon energy thresholds. Th...

The pattern of the radio emission of air showers is finely sampled with the LowFrequency ARray (LOFAR). A set of 382 measured air showers is used to test a fast, analytic parameterization of the distribution of pulse powers. Using this parameterization we are able to reconstruct the shower axis and give estimators for the energy of the air shower as well as the distance to the shower maximum.

The HEGRA system of Imaging Atmospheric Cherenkov Telescopes (IACTs) detects Cherenkov light produced by air showers. The concept of stereoscopic observation with the five HEGRA telescopes allows the reconstruction of various shower parameters, for example the shower direction, the location of the shower core and the energy of cosmic rays. One of the telescopes was modified so that measurements...

A new method is explored to detect extensive air showers: the measurement of radio waves emitted during the propagation of the electromagnetic shower component in the magnetic field of the Earth. Recent results of the pioneering experiment LOPES are discussed. It registers radio signals in the frequency range between 40 and 80 MHz. The intensity of the measured radio emission is investigated as...

the phenomena of extensive air shower (eas) are produced by the collision of primary cosmic rays (cr) with energy more than ev with the atmospheric molecules. as a result the electron and muon components (cascades) of eas develop through the air.  the study of such cascades gives important information about the primary cr mass composition as well as its astrophysical origin models. one of the e...

A system of large-area position-sensitive multiwire proportional chambers (MWPC), installed below the hadron calorimeter of the central detector of the KASCADE (KArlsruhe Shower Core and Array DEtector) experiment is able to observe the density distributions of high-energy muons and of the high-energy tails of the hadron spectrum in the core of extensive air showers (EAS). Applying a classi cat...

Muons with a high transverse momentum (pT ) are produced in cosmic ray air showers via semileptonic decay of heavy quarks and the decay of high pT kaons and pions. These high pT muons have a large lateral separation from the shower core muon bundle. IceCube is well suited for the detection of high pT muons. The surface shower array can determine the energy, core location and direction of the co...