抄録
An attempt is made to examine the energy gain or loss of the primary cosmic ray produced by an electro-magnetic field of solar stream, and then to explain the diurnal variation of cosmic rays at the time of the magnetic storm by this energy variation of cosmic rays.
The amplitudes and the times of the maximum intensity of the diurnal variations are calculated at various altitudes and latitudes by using the above mentioned electric field.
Whether the diurnal variation of cosmic rays averaged over all days can be explained or not from the standpoint of the electric field hypothesis is also discussed.
