1Muon tracking in KASCADE-Grande: Lateral distributions of EAS muon densities

allows to measure with high accuracy ( ∼ 0.3o) muon directions in Extensive Air Shower up to 700 m distance from the shower centre. According to the simulations within such a distance, in showers initiated by primaries with energies 1016–1017 eV, nearly all muons reaching the observation level are subject of investigation. Study of lateral distributions of muon densities allows to investigate not only the longitudinal development of the Extensive Air Shower but also to check performance of the Muon Tracking Detector. Measuring muon tracks and their angles with respect to the shower direction it is possible to study also such quantities like mean muon production heights and muon pseudorapidities. They are not only sensitive to the longitudinal shower development but are a tool for testing hadronic interaction models and investigating cosmic ray mass composition. The description of the detector, its capabilities to investigate the longitudinal development of muonic component in EAS, especially by means of studying lateral distributions of muon densities, will be presented. Preliminary results of these distri-butions will be shown. I