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Joined 2026-09-21 Message
Incoming links: 100 Years of Cosmic Rays by DESY
Karl Bergwitz Created 2026-10-18 Updated 2026-11-05
Karl Bergwitz made early balloon measurements of atmospheric ionization, comparing the detector response at altitude with observations nearer the ground. These experiments tested expectations for radiation originating in the terrestrial environment.[ref]
100 Years of Cosmic Rays by DESY. First panel: balloon electrometer measurements and detector limitations
The experiment's value lies in changing the material between a proposed source and the detector. Interpretation also depends on instrumental behaviour under changing conditions, so altitude dependence must be separated from leakage, calibration changes and the detector's own background.
Theodor Wulf Created 2026-10-18 Updated 2026-11-05
Theodor Wulf developed a transportable electrometer for measuring atmospheric ionization. His design used fine fibres in place of delicate metal leaves, making outdoor measurements easier to calibrate. Comparisons at different heights, including the Eiffel Tower, tested whether radiation from the ground explained the ionization.[ref]
The method infers ion production from loss of stored electric charge. Leakage and instrument stability must therefore be controlled before a change in discharge rate is interpreted as a change in penetrating radiation.