Abstract:A large cosmic ray intensity wave in which a single oscillation of the galactic flux with a peak‐to‐peak amplitude of about 4% and a period of approximately 27 hours, occurred on October 27‐28, 1977. This unusual intensity profile was not associated with a classical Forbush decrease. Harmonic analysis in Universal Time of data from a global distribution of stations revealed that in each case the diurnal vector on October 27 differs significantly from those on other days before and after the event. Furthermore,… Show more
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