Abstract

Effects on the propagation of energetic solar particles indicate the presence of an interplanetary magnetic field. The effect of this field is greatest for particles of energy of about 109 ev, indicating that particles of lower energy, associated with polar-cap absorption, propagate as a group, with kinetic energy density comparable to the magnetic energy density of regions of the interplanetary field. A model proposed to explain various characteristics of the solar particles is found to account also for the main features of solar modulation of galactic cosmic rays.

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