Study for the molecular bremsstrahlung from extensive air showers

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This is a basic research for the molecular bremsstrahlung from extensive air showers induced by high energy cosmic rays. This technique can be expected to provide a new detection method for cosmic rays with a good angular and energy resolutions and also with 100% of running time efficiency. We developed two sets of radio telescopes in Osaka and in Utah, USA. In Osaka, we were coincidentally operating two Ku band radio telescopes with an air shower array, and detected radio signals coincidently with air showers. But the observed event rate is smaller than a theoretical expectation. In Utah, we installed two telescopes that operated coincidentally with an electron linear accelerator. We did not detect any radio signals from accelerated electron beams.