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Ion production rate in a boreal forest based on ion, particle and radiation measurements

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Fig. 1. Setup of the radon monitoring system (HV: high voltage, GM: Geiger-Mueller).
Fig. 2. Average factor d N/dl og(d p )β(d p , q) (see Eq. 2) for period from 20 March to 13 April 2003
Fig. 3. Ion production rates calculated from external radiation and radon measurements and based on DMPS, BSMA and APS measurements
Fig. 4. Radon-based ion production and the stability of the lower boundary layer indicated by the flux Richardson number Rf .
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