The intensity variations of solar and galactic cosmic rays with azimuthal angle in the polar region

A balloon-born multidirectional detector is used to measure the intensity variation of galactic and solar cosmic rays with the azimuthal angle, the zenith angle being maintained at 600. In polar regions, the intensity towards the north is found to be 20 % larger than that towards the south. It is shown that this anisotropy does not originate in interplanetary space and is not produced by a magnetospheric source. It is suggested that the effect is due to propagation effects within the magnetosphere. (author)