Propagation of energetic particles through interplanetary space according to the data of 11-yr cosmic ray variations

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Scientific paper

The size of the region occupied by the solar wind and the transport scattering path of the particles of various energies are determined and the change in the spectrum of magnetic inhomogeneities in the wind with changing the solar activity is studied on tne basis of investigation of the 11-yr variations of the cosmic rays of relatively high energies taking account of the lag of the change in the conditions in the interplanetary space with respect to the processes on the Sun. The solar wind properties are also found for the period of solar minimum. The residual modulation for the particles of various energies at solar minimum is determined and the true cosmic ray intensity beyond the region of the solar wind is evaluated. Analysis of the expected variations in the ranges of various energies for the protons, [alpha]-particles and electrons of the galactic cosmic rays is also carried outE The spectrum of the cosmic ray rigidities beyond the modulation region outside the solar system is determined. It has been shown that an essential part of the [`]bend' of the spectrum is due to modulation in the interplanetary space. Other possible causes of the [`]bend' are also discussed. The expected gradient of the cosmic ray intensity in the interplanetary space is evaluated as a function of Z and particle rigidity. The results obtained on the gradient are in agreement with the data from [`]Mariner 2'. The change in the electromagnetic conditions in the interplanetary space with decrease in solar activity is evaluated according to the data of the stratospheric measurements in July, 1963 and of [`]IMP-1' measurements.

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