Abstract
A method for determining the long-term spectrum of cosmic ray (CR) variations from observations with different ground-based (neutron monitors) and near-earth (stratosphere and satellite) detectors was presented in our previous works. In this paper, muon telescope data (Nagoya) are added, expanding the analyzed energy range and allowing us to determine the rigidity spectrum for 1974–2011. The data from the above devices for these years can be used jointly. The rigidity spectrum for the sunspot minimum of the 24th cycle was studied and compared with the CR intensity for the sunspot minima of other cycles. The reasons for abnormally high CR density during the minimum of the 24th cycle and other features of this period are discussed.
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