Structure of long-term variations of the plasma parameters and magnetic field in the near-earth heliosphere

The methods of the fast Fourier transform, spectrum-time analysis, and wavelet analysis are used to study the structure and dynamics of rhythmic and arrythmic variations of the main parameters of solar wind, as well as the interplanetary and solar magnetic field at time scales from days to tens of years. A large variety of the observed regular and irregular variations in the near-Earth heliosphere is explained by a number of reasons: (1) the variability of unstable processes on the Sun and in the region of solar wind formation, (2) the solar rotation and the associated inhomogeneities in its corona, (3) and the Earth's orbital motion. Irregular, aperiodic variations are present for all parameters and at all time scales. The most prominent regular variations al-e related to cyclic processes on the Sun and its rotation.