Exact(5)
However, the periodicity of 7 days is reliably revealed in other parameters characterizing galactic cosmic rays, SW, solar and geomagnetic activities, especially for the minimum epoch of solar activity.
In particular, solar cycle 23 seems to have had an extreme ultraviolet (EUV) emission greater than that deduced from traditional solar EUV proxies during the maximum epoch and lower during the minimum epoch.
This dependence is stronger in the maximum epoch than in the minimum epoch of solar activity, and is provided by the essential temporal rearrangements of the structure of the Interplanetary Magnetic Field (IMF) turbulence from the maxima to minima epoch of solar activity.
We find that the soft rigidity spectrum of the Galactic Cosmic Ray (GCR) intensity variations for the maximum epoch and the hard rigidity spectrum for the minimum epoch calculated based on the neutron monitors experimental data (1960 2002) are related with the various dependence of the diffusion coefficient on the GCR particle's rigidity for different epoch of solar activity.
The exponents νy and νz of the power spectral density of the By and Bz components of the IMF in the region of the frequencies (10−6– 4 × 10−6) Hz are larger for the minimum epoch of 1987 (νy ≈ 2.0 and νz ≈ 1.93) than for the maximum epoch of 1990 (νy ≈ 1.43 and νz ≈ 1.27).
Similar(55)
It is suggested that the cycle-to-cycle decrease of the CR density in the minimum epochs of the past solar activity (SA) cycles could be explained by the decrease of the zone-odd index.
We show that the rigidity spectrum of the long-period variations of the GCR intensity is hard in the minimum epochs of solar activity (γ ≈ 0.6) when the exponent νy of the PSD of the IMF is higher (νy ≈ 1.9), and is soft in the maximum epochs (γ ≈ 1.2), when the exponent νy is relatively lower (νy ≈ 1.4).
The dependence of the diffusion coefficient on the cosmic ray particles rigidity R is stronger in the maxima epoch than in the minima epoch of solar activity.
It is concluded that this radical redistributions of the DVIF's fluctuations from the maxima to the minima epochs is one of the general reasons (mechanism) of the 11-year variation of the galactic cosmic rays m 2003 COSPAR.
The temporal changes of the energy spectrum of galactic cosmic rays isotropic intensity variations from the maxima to the minima epochs of solar activity indicate the radical redistributions of the EAF's fluctuations (irregularities) from the higher frequencies to the lower frequencies.
The expected amplitude (from theoretical modeling of galactic cosmic rays transport) of the 27-day variation is greater in the qA > 0 than in the qA < 0 solar magnetic cycles being in good agreement with the experimental data for the minima epochs of solar activity.
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