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The radio approach for detecting the ultra-high energy cosmic neutrinos hasbecome a mature field. The Cherenkov signals in radio detection are originatedfrom the charge excess of particle showers due to Askaryan effect. Theconventional way of calculating the Cherenkov pulses by making Fraunhoferapproximation fails when the sizes of the elongated showers become comparablewith the detection distances. We present a calculation method of Cherenkovpulses based on the finite-difference time-domain (FDTD) method, and attain asatisfying effeciency via the GPU- acceleration. Our method provides astraightforward way of the near field calculation, which would be important forultra high energy particle showers, especailly the electromagnetic showersinduced by the high energy leptons produced in the neutrino charge currentinteractions.

A GPU-based Calculation Method for Near Field Effects of Cherenkov Radiation Induced by Ultra High Energy Cosmic Neutrinos