Abstract
DUPERIER1 has analysed the first harmonic of the apparent solar diurnal variation of cosmic rays at London, using a method due to Thompson2. He finds that the first harmonic for any month has three components, namely, (i) a mean solar vector M, (ii) a vector, A, altering the amplitude of M, and (iii) a vector, P, controlling the change of phase of M. The P vector may arise from either (a) a sidereal diurnal variation, (b) an annual solar variation, or (c) a combination of these effects. This communication discusses the interpretation to be placed on the P vector, by comparing Duperier‘s figures for London with the results obtained at Canberra.
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