Abstract
We present the results of a spectral analysis in the frequency domain of the fluctuations of cosmic rays extended to primary rigidity ∼250 GV. The experimental power spectrum is compared with that expected on the basis of the theory of interplanetary scintillations, Forbush effect and the effects of CM passages of solar recurrent active regions. The agreement confirms the influence of heliospheric phenomena up to 250 GV and the presence of nonlinear interactions between particles and interplanetary magnetic fields.
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