!Please note that if no Date to: appears below, the measurements are ongoing!
Location of measured variable
1985-1990 the resolution was 1 hour. From 2000 onwards, the resolution is 1 minute. Wilson antenna: Metal circle (0.5 radius) or plate 0.5m x 0.5m. Range +/-20 pA/m2, sensitivity 0.1 pA/m2 .Time constant 1s.