Focusing properties of the Parker magnetic field
The motion of protons with energies of up to 10 GeV ejected from the sphere and moving in the Parker magnetic field is considerd. Results show that the Parker magnetic field has certain focusing properties: (1) if magnetic field is positive, all of the energetic protons radially ejected from the sphere are attracted by the field in the equatorial plane; (2) if the magnetic field is negative, the protons are focused into a narrow beam along the field’s axis of symmetry.