Abstract
Power-spectral analysis of cosmic-ray indices (CRI) data for the years 1989–1991 shows a 170-day periodicity of cosmic rays. The periodicity is related to a strong magnetic field. Power-spectral analysis of the long-term periodicity (∼11 years) of the CRI data for the years 1953–1997 shows that the period 1989–1991 is a unique one in the sense of the discussed pronounced periodicity. The 170-day periodicity of cosmic rays was interpreted in the base of six solar rotations (1 SR = 28.3-day periodicity of 10.7 cm solar radio flux) and may be connected to the instability of the solar core.
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Joshi, A. Cosmic-ray Periodicity at 170 Days. Solar Physics 185, 397–403 (1999). https://doi.org/10.1023/A:1005129016485
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DOI: https://doi.org/10.1023/A:1005129016485