1.V. S. Berezinskii, S. V. Bulanov, V. L. Ginzburg, et al., Astrophysics of Cosmic Rays (Nauka, Moscow, 1984; North Holland, Amsterdam, 1990).

2.J. C. Brandt, Introduction to the Solar Wind (Freeman, San Francisco, 1970; Mir, Moscow, 1973).

3.A. Z. Dolginov and I. N. Toptygin, “Multiple scattering of particles in a magnetic field with random inhomogeneities,” Sov. Phys. JETP 24, 1195–1202 (1967).

4.L. I. Dorman, Experimental and Theoretical Foundations of Cosmic Ray Astrophysics (Nauka, Moscow, 1975) [in Russian].

5.Yu. L. Kolesnik and B. A. Shakhov, “Effect of the heliosheath and standing termination shock on galactic cosmic ray propagation in a stationary heliosphere model,” Kinematics Phys. Celestial Bodies 28, 261–269 (2012).
https://doi.org/10.3103/S0884591312060049

6.I. N. Toptygin, Cosmic Rays in Interplanetary Magnetic Fields (Nauka, Moscow, 1983; Springer-Verlag, Dordrecht, 1985).
https://doi.org/10.1007/978-94-009-5257-7

7.Yu. I. Fedorov, “Modulation of galactic cosmic ray intensity in the turbulent heliosphere,” Kinematics Phys. Celestial Bodies 31, 105–118 (2015).
https://doi.org/10.3103/S0884591315030034

8.B. A. Shakhov and Yu. L. Kolesnik, “Iterative method for solving boundary-value problems in the theory of cosmic ray propagation,” Kinematics Phys. Celestial Bodies 22, 75–80 (2006).

9.D. Bisschoff and M. S. Potgieter, “New local interstellar spectra for protons, helium and carbon derived from PAMELA and Voyager 1 observations,” Astrophys. Space Sci. 361, 48 (2016).
https://arxiv.org/abs/1512.04836.
https://doi.org/10.1007/s10509-015-2633-8

10.L. F. Burlaga, N. F. Ness, and E. C. Stone, “Magnetic field observations as Voyager 1 entered the heliosheath depletion region,” Science 341, 147–150 (2013).
https://doi.org/10.1126/science.1235451

11.A. C. Cummings, E. C. Stone, B. C. Heikkila, et al. “Voyager 1 observations of galactic cosmic rays in the local interstellar medium: Energy density and ionization rates,” in Proc. 34th Int. Cosmic Ray Conf., The Hague, Netherlands, July 30–Aug. 6, 2015 (SISSA, 2015), paper id. PoS(ICRC2015)318.
https://doi.org/10.22323/1.236.0318

12.L. I. Dorman, M. E. Katz, Yu. I. Fedorov, and B. A. Shakhov, “Variations of cosmic-ray energy in interplanetary space,” Astrophys. Space Sci. 94, 43–95 (1983).
https://doi.org/10.1007/BF00651760

13.L. A. Fisk and W. I. Axford, “Anisotropies of solar cosmic rays,” Sol. Phys. 7, 486–498 (1969).
https://doi.org/10.1007/BF00146151

14.V. Florinski and N. V. Pogorelov, “Four-dimensional transport of galactic cosmic rays in the outer heliosphere and heliosheath,” Astrophys. J. 701, 642–651 (2009).
https://doi.org/10.1088/0004-637X/701/1/642

15.L. J. Gleeson and W. I. Axford, “Solar modulation of galactic cosmic rays,” Astrophys. J. 154, 1011–1026 (1968).
https://doi.org/10.1086/149822

16.L. J. Gleeson and I. H. Urch, “A study of the force-field equation for the propagation of galactic cosmic rays,” Astrophys. Space Sci. 25, 387–404 (1973).
https://doi.org/10.1007/BF00649180

17.L. J. Gleeson and G. M. Webb, “Energy changes of cosmic rays in the interplanetary region,” Astrophys. Space Sci. 58, 21–39 (1987).
https://doi.org/10.1007/BF00645373

18.M. L. Goldstein, R. Ramaty, and L. A. Fisk, “Interstellar cosmic ray spectra from the nonthermal radio background from 0.4 to 400 MHz,” Phys. Rev. Lett. 24, 1193–1196 (1970).
https://doi.org/10.1103/PhysRevLett.24.1193

19.X. Guo and V. Florinski, “Galactic cosmic-ray modulation near the heliopause,” Astrophys. J. 793, 18 (2014).
https://doi.org/10.1088/0004-637X/793/1/18

20.K. Herbst, B. Heber, A. Kopp, et al., “The local interstellar spectrum beyond the heliopause: what can be learned from Voyager in the inner heliosheath?,” Astrophys. J. 761, 17 (2012).
https://doi.org/10.1088/0004-637X/761/1/17

21.J. Kóta and J. R. Jokipii, “Are cosmic rays modulated beyond the heliopause?,” Astrophys. J. 782, 24 (2014).
https://doi.org/10.1088/0004-637X/782/1/24

22.S. M. Krimigis, R. B. Decker, E. C. Roelof, et al., “Search for the exit: Voyager 1 at heliosphere’s border with the galaxy,” Science 341, 144–147 (2013).
https://doi.org/10.1126/science.1235721

23.R. Manuel, S. E. S. Ferreira, and M. S. Potgieter, “Time-dependent modulation of cosmic rays in the heliosphere,” Sol. Phys. 289, 2207–2231 (2014).
https://doi.org/10.1007/s11207-013-0445-y

24.H. Moraal, “Cosmic-ray modulation equations,” Space Sci. Rev. 176, 299–319 (2013).
https://doi.org/10.1007/s11214-011-9819-3

25.E. N. Parker, “The passage of energetic charged particles through interplanetary space,” Planet Space Sci. 13, 9–49 (1965).
https://doi.org/10.1016/0032-0633(65)90131-5

26.J. S. Perko, “Solar modulation of galactic antiprotons,” Astron. Astrophys. 184, 119–121 (1987).

27.M. S. Potgieter, “Solar modulation of cosmic rays,” Living Rev. Sol. Phys. 10, 3 (2013).
https://doi.org/10.12942/lrsp-2013-3

28.M. S. Potgieter, “Very local interstellar spectra for galactic electrons, protons and helium,” Braz. J. Phys. 44, 581 (2014).
https://doi.org/10.1007/s13538-014-0238-2

29.M. S. Potgieter and R. T. Strauss, “At what rigidity does the solar modulation of galactic cosmic rays begin?” in Proc. 33rd Int. Cosmic Ray Conf. (ICRC2013), Rio de Janeiro, July 2–9, 2013 (Braz. Phys. Soc., 2013), paper id. ICRC2013-0156.

30.V. S. Ptuskin, H. J. Völk, V. N. Zirakashvili, and D. Breitschwerdt, “Transport of relativistic nucleons in a galactic wind driven by cosmic rays,” Astron. Astrophys. 321, 434–443 (1997).

31.J. D. Richardson and L. F. Burlaga, “The solar wind in the outer heliosphere and heliosheath,” Space Sci. Rev. 176, 217–235 (2013).
https://doi.org/10.1007/s11214-011-9825-5

32.K. Scherer, H. Fichtner, R. D. Strauss, et al., “On cosmic ray modulation beyond the heliopause: Where is the modulation boundary?,” Astrophys. J. 735, 128 (2011).
https://doi.org/10.1088/0004-637X/735/2/128

33.R. Schlickeiser, Cosmic Ray Astrophysics (Springer-Verlag, Berlin, 2002).
https://doi.org/10.1007/978-3-662-04814-6

34.E. C. Stone, A. C. Cummings, F. B. McDonald, et al., “Voyager 1 observes low-energy galactic cosmic rays in a region depleted of heliospheric ions,” Science 341, 150–153 (2013).
https://doi.org/10.1126/science.1236408

35.R. D. Strauss and H. Fichtner, “Cosmic ray anisotropies near the heliopause,” Astron. Astrophys., Lett. 572, L3 (2014).
https://doi.org/10.1051/0004-6361/201424842

36.I. H. Urch and L. J. Gleeson, “Galactic cosmic ray modulation from 1965–1970,” Astrophys. Space Sci. 17, 426–446 (1972).
https://doi.org/10.1007/BF00642912

37.H. J. Völk, “Cosmic ray propagation in interplanetary space,” Rev. Geophys. Space Phys. 13, 547–566 (1975).
https://doi.org/10.1029/RG013i004p00547

38.W. R. Webber, P. R. Higbie, and F. B. McDonald, “The unfolding of the spectra of low energy galactic cosmic ray H and He nuclei as the Voyager 1 spacecraft exits the region of heliospheric modulation” (2013). https://arxiv.org/abs/1308.1895.

39.W. R. Webber and F. B. McDonald, “Recent Voyager 1 data indicate that on 25 August 2012 at a distance of 121.7 AU from the Sun, sudden and unprecedented intensity changes were observed in anomalous and galactic cosmic rays,” Geophys. Res. Lett. 40, 1665–1668 (2013).
https://doi.org/10.1002/grl.50383

40.M. Zhang, X. Luo, and N. Pogorelov, “Where is the cosmic-ray modulation boundary of the heliosphere?,” Phys. Plasmas 22, 091501 (2015).
https://doi.org/10.1063/1.4928945