ANGULAR DISTRIBUTION OF CHARGED PARTICLES IN THE ATMOSPHERE RESULTS OF THE ADAM EXPERIMENT ON BEXUS 19

Particle showers, which produce a large number of secondary particles, are generated by the interaction of high-energy cosmic ray particles with the Earth's atmosphere. The Team ADAM (Angular Distribution of charged particles - Atmosphere Measurement) has flown an experiment to measure the altitude- dependent angular distribution of secondary charged particles on a stratospheric balloon within the REXUS/BEXUS programme in October 2014. We designed a sensor head consisting of 16 planar silicon semi-conductor detectors (SSDs), which allowed us to determine the zenith-angle of individual particles by coincidence measurements. After a year of development and testing, on October 9th the instrument performed measurements for 4 hours in an altitude of 27 km in northern Sweden. In this contribution measurements performed during the flight in comparison to ones obtained on ground will be presented. On the one hand we focus on the count and dose rate profiles as functions of residual pressure, on the other hand we discuss the angular distribution below and above the PFOTZER-Maximum.