Extensive air showers (EAS) are known for about 70 years to be cascades initiated by primary cosmic rays in the atmosphere. As such, they serve as connection to the highest particle energies nature is offering, especially at energies exceeding 10 eV where direct measurements of cosmic rays are hampered by the low primary flux. EAS can be viewed as tools for astroparticle physics. The main task ...

The new hadronic Monte Carlo model QGSJET-II is applied for extensive air shower (EAS) calculations. The obtained results are compared to the predictions of the original QGSJET and of the SIBYLL 2.1 interaction models. It is shown that non-linear effects change substantially model predictions for hadron-nucleus interactions and produce observable effects for calculated EAS characteristics. Fina...

It is shown that using the observed extensive air shower (EAS) electron and truncated muon size spectra at sea level one can solve the EAS inverse problem reconstruction of primary energy spectra and elemental composition, for not more than 2 kinds of primary nuclei. ∗e-mail:[email protected]

The problem of the uniqueness of solutions during the evaluation of primary energy spectra in the knee region using an extensive air shower (EAS) data set and the EAS inverse approach is investigated. It is shown that the unfolding of primary energy spectra in the knee region leads to mutually compensative pseudo solutions. These solutions may be the reason for the observed disagreements in the...

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...

Data taken during half a year of operation of 10 LOPES antennas (LOPES-10), triggered by EAS observed with KASCADE-Grande have been analysed. We report about the analysis of correlations of radio signals measured by LOPES-10 with extensive air shower events reconstructed by KASCADE-Grande, including shower cores at large distances. The efficiency of detecting radio signals induced by air shower...

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, installed in the bottom of the central detector of the KASCADE experiment is able to observe the density distributions of extensive air shower components in the shower core. Using the method of multifractal moments, a mass sensitive parametrisation of the density distributions is given. In combination with additionally m...

The interpretation of extensive air shower (EAS) measurements is strongly dependent on the hadronic interaction models used for simulating reference showers. We study the importance of low-energy hadronic interactions in simulated air showers, generated with the simulation package CORSIKA, for the observed characteristics of extensive air showers. In particular we investigate in detail the ener...