Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9719149s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A12, p. 19,149-19,155.
Physics
5
Anisotropy, Cosmic Rays, Interplanetary Magnetic Fields, Sine Waves, Solar Rotation, Twenty-Seven Day Variation, Earth Rotation, Magnetic Field Configurations, Periodic Variations, Solar Activity
Scientific paper
Waves in the cosmic ray north-south anisotropy (Swinson, 1969, 1971) were examined using the GG component of data from the Nagoya cosmic ray muon telescope for the time period 1971-1989. Pronounced waves with a period of 27 days were found to be present in most of the data. The amplitudes of the 27-d waves in both the cosmic ray north-south anisotropy and in By component of the IMF were found to exhibit a pronounced annual variation as well as a variation with a period of about 11 years. The variations in these two sets of data were compared with the values for the tilt of the heliospheric neutral sheet over the same period, and it was found that the large annual waves in the 27-d amplitudes coincided with relatively rapid excursions in the tilt of the neutral sheet.
Swinson Derek B.
Yasue S.-I.
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