Hidekazu Shimodaira

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Since 2007, the Telescope Array (TA) experiment, based in Utah, USA, has been observing ultra high energy cosmic rays to understand their origins. The experiment involves a surface detector (SD) array and three fluores-cence detector (FD) stations. FD stations, installed surrounding the SD array, measure the air fluorescence light emitted from extensive air(More)
We measure the spectrum of cosmic rays with energies greater than 10 18.2 eV with the Fluorescence Detectors (FDs) and the Surface Detectors (SDs) of the Telescope Array Experiment using the data taken in our first 2.3-year observation A hybrid air shower reconstruction technique is employed to improve accuracies in determination of arrival directions and(More)