Sidereal cosmic ray variation and its relation with the interplanetary magnetic field polarity.

Abstract

Data from µ-meson telescopes, at different underground depths, have been compared with the predictions of a solar-controlled mechanism proposed by Swinson. The observations at ground level and at moderate depths show a significant field-polarity dependent effect of the kind envisaged by Swinson. The observations at depths greater than 40 m.w.e. do not show an obvious Swinson effect. An explanation is given in terms of the response function of the recorders. The small sidereal variation observed at 60 m.w.e. is explained in terms of the motion of the solar system relative to nearby stars.