Abstract
The cosmic-ray differential density spectrum in the range 3 to 10000 p/m2 has been obtained, using Wilson cloud chambers, at sea level and at 2285 m a.s.l. In neither case can the whole spectrum be fitted by a single power law. Using a three-parameter fit the sea-level spectrum is best approximated by two power laws of exponents − 2.491±0.036 and −3.42±0.32, respectively, joining at 560± 180 particles per square metre. At 2285 m a.s.l. the three best parameters are − 2.431 ±0.015, − 4.8−0.8+1.3 and 6000−800+1000 particles per square metre. The change with altitude supports the hypothesis that the change in exponent is due to a steepening of the primary cosmic-ray energy spectrum.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
