Abstract
The air fluorescence technique is used to detect ultrahigh-energy cosmic rays (UHECR), and to estimate their energy. Of fundamental importance is the photon yield due to excitation by electrons, in air of various densities and temperatures. After our previous report, the experiment has been continued using a 90Sr β source to study the pressure dependence of photon yields for radiation in nitrogen and dry air. The photon yields in 15 wave bands between 300nm and 430nm have been determined. The total photon yield between 300nm and 406nm (used in most experiments) in air excited by a 0.85MeV electron is 3.81±0.13 (±13% systematics) photons per meter at 1013hPa and 20°C. The air density and temperature dependencies of 15 wave bands are given for application to UHECR observations.
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