Rapid atmospheric monitoring after the detection of high-energy showers at the Pierre Auger Observatory

PIERRE AUGER COLLABORATION (J. ABRAHAM, ... , A. MARIAZZI, ET AL)

Lodz, Polonia

Conferencia; 31th International Cosmic Ray Conference; 2009

The atmospheric monitoring program ofthe Pierre Auger Observatory has been upgradedto make measurements of atmospheric conditionspossible after the detection of very high-energy showers.Measurements of the optical transmittance dueto aerosols and clouds are time-critical. Therefore,observations of atmospheric regions close to a showertrack of interest are performed within ten minutes ofa shower detection using LIDAR and telescope monitors.Measurements of the altitude dependence ofatmospheric state variables such as air temperature,pressure, and humidity are performed within abouttwo hours following the detection of a very highenergyevent using meteorological radio soundings.Both programs are triggered using a full onlinereconstruction with analysis-level quality cuts. Wedescribe the implementation of the online trigger, anddiscuss the impact of the monitoring data with highresolution on the analysis of air shower events.