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The nitrogen fluorescence induced in air is used to detect ultra-high energycosmic rays and to measure their energy. The precise knowledge of the absolutefluorescence yield is the key quantity to improve the accuracy on the cosmicray energy. The total yield has been measured in dry air using a 90Sr sourceand a [300-430 nm] filter. The fluorescence yield in air is 4.23 $\pm$ 0.20photons per meter when normalized to 760 mmHg, 15 degrees C and with anelectron energy of 0.85 MeV. This result is consistent with previousexperiments made at various energies, but with an accuracy improved by a factorof about 3. For the first time, the absolute continuous spectrum of nitrogenexcited by 90Sr electrons has also been measured with a spectrometer. Detailsof this experiment are given in one of the author's PhD thesis [32].

Absolute measurement of the nitrogen fluorescence yield in air between 300 and 430 nm