Spectrum of Daily Variations Between 50 and 200 GV

摘要

High-rigidity cosmic ray anisotropy of solar origin is interpreted in terms of regular particle motion - without diffusion being involved - in the large-scale interplanetary magnetic field (IMF). Anisotropy appears as a result of the wavy shape of the neutral sheet separating the IMF regions of alternate polarities. Energy losses suffered by particles along various trajectories are computed to obtain the solar and sidereal daily waves expected. It is suggested that long-term variations in the spectrum of corotation can be ascribed to variations in the wave height of the neutral sheet during a solar cycle. The change of the solar diurnal vector as observed to take place in 1969 is accounted for. Also discussed are the semidiurnal and the polarity-dependent sidereal waves as well as the radial density gradient predicted. (Atomindex citation 11:503894)