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The Cosmic Rays as a Generator for a Current Ring in the Galaxy

explained by existence of the magnetic field with the induction B T ≈ ⋅ − 3 10 10 naturally. Such fields were discovered near the Sun by the observations[1]. These fields are parallel to a galactic plane or the spiral arms. The fluctuations in scale up to 0,3 pc that are comparable with the basic field impose on it. Sometimes directions of the fields may be different by some dimensions in adjacent arms or in the same arm but on the different sides of a symmetry plane. It says about a complex structure of the field, its topology in the Galaxy as whole is not known. Even the supposition on absence of a regular field in the Galaxy was said [1]. However, such regular structure is discovered in some galaxies, more often di-polar and more rarely – bi-modal [2]. It gives a reason to suppose that our Galaxy has a general field besides a chaotic one. A di-polar field may be considered as the first approximation. In steadystate it must be supported also by a current ring. The spiral arm local fields may be considered in definite sense as the details of a general field but supporting of them may be a result of the other or additional processes connected with the density waves spreading for example. The gravitating systems with the currents were considered in the papers [3,4], but comparing them with the real galaxies is difficult. In work [5] a model for currents and magnetic field of our Galaxy is proposed. This model allows not only comparison with the observations but explains some peculiarities of its dynamics. The model is totality of two constituents stellar and current-conducting diffusion ones. It is supposed the stellar constituent has a conditional boundary at R = R2 = 20kpc and diffusion one concentrates near the symmetry plane and goes out the limit R2, although the last do not essential for the model. The current density projected on the symmetry plane i = jH (where H is an equivalent thickness of conducting layer). It increases from zero in centre to maximum value ( i0 = 10 A/m) at R = R1 = 3kpc. Then it decreases quickly to zero at R = R3 = 30kpc. Minus corresponds to the Galaxy rotation with the diffusion layer in direction of decreasing longitudes. The full current in a ring is I = -10A. The magnetic field created by such rough flat current ring is poloidal and is written in a clear view through the elliptical integrals. Its vertical component may be approximated with sufficient accuracy at z = 0 by the simple equation