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Anisotropy of cosmic radiation in the Galaxy (1975)

GOMBOSI, T. ; KOTA, J. ; SOMOGYI, A. J. ; [et al.]

[s.l.] : Nature Publishing Group

Nature 255 (1975), S. 687-689

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] The results of other anisotropy measurements are also shown in Fig. 1. Some of these1"3 give upper limits only; others3"5 do indicate some anisotropy. But the Hobart measurement4 is at low energies for which solar modulation effects are not negligible, and the residual solar waves obtained at ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/255687a0

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The effect of solar wind latitudinal dependence on the cosmic-ray propagation in the heliosphere (1991)

Georgiev, L. M. ; Kavlakov, S. P. ; Popov, J. R.

Springer

Astrophysics and space science 175 (1991), S. 173-189

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ISSN: 1572-946X

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract We have investigated how the latitude dependence of the solar wind velocity (SWV) influenced the cosmic-ray (CR) modulation and distribution in the heliosphere. The dependence proposed by Fry and Akasofu (1987) is used:v SW=v O+v 1(1-cos n λ m , where the SWV,v SW is a function of the heliomagnetic latitude λ m andv 0 andv 1 are constants. An estimation of the diffusion and drift terms in the transport equation is made, which shows that towards the poles the effects of the drift transfer decrease, while the diffusion terms in the equation increase due to the change of the interplanetary magnetic field (IMF) geometry. The numerical solutions of the two-dimensional (2-D) transport equation show that when the SWV changes with latitude: (1) The CR intensities away from the neutral sheet are larger for both IMF polarity periods in comparison with the case when the SWV does not change with the latitude. (2) The latitude gradients are negative during negative magnetic polarity periods. (3) The Voyager 1 and Voyager 2 long-time observations showing greater galactic CR intensities nearer the Sun at greater distances, could be explained by the proposed model.