Abstract
An annual variation of cosmic rays (AVCR) with an amplitude of ≥1% and a minimum in the summer months is found in the data from the world network of neutron monitors (NMs). This variation was observed in 2011–2013 at almost all NMs: subequatorial, midlatitude, and circumpolar. It was also present in variations of CR density registered during a global survey. The detected anomalous variation is of extraterrestrial origin but is independent of variations in the Earth’s heliolatitude. A similar but less intense variation was registered in 1973–1976 and then not detected again for almost 40 years. Possible causes of this phenomenon are considered. It is shown that quasi-annual variations in the IMF and the parameters of the solar wind and solar magnetic field were observed during the same period (2011–2013). These variations are in good agreement with the detected variations in CRs.
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