Monitoring of the ATLAS liquid argon calorimeter

The ATLAS detector at the Large Hadron Collider is expected to collect an unprecedented wealth of new data at a completely new energy scale. In particular its Liquid Argon electromagnetic and hadronic calorimeters will play an essential role in measuring final states with electrons and photons and in contributing to the measurement of jets and missing transverse energy. Efficient monitoring of data will be crucial from the earliest data taking onward and is implemented at multiple levels of the read-out and triggering systems. By providing essential information about the performance of each partition and its impact on physics quantities, the monitoring will be crucial in guaranteeing data to be ready for physics analysis. The tools and criteria for monitoring the Liquid Argon data in the cosmics data taking will be discussed. The software developed for the monitoring of collision data will be described and the results of monitoring performance for data obtained from cosmics data will be presented.