Changes in Amplitude of the Cosmic-Ray 27-Day Intensity Variation with Solar Activity
- 15 November 1954
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 96 (4), 1085-1088
- https://doi.org/10.1103/physrev.96.1085
Abstract
Both cosmic-ray neutron and ionization-chamber intensity observations reveal that the amplitude of the 27-day recurring intensity variation has been changing over an interval of several years. A method for studying this phenomenon using ionization chamber data for the period 1936-1946 and neutron intensity data for 1951-1953 is described which not only selects preferentially the 27-day variations but also selects the variations which are world wide.Keywords
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