Physics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95..209v&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Jan. 1, 1990, p. 209-214. Research supported by the South African Mar
Physics
2
Cosmic Rays, Equators, Radiation Distribution, Secular Variations, Particle Energy, Ray Tracing
Scientific paper
Data of a number of latitude surveys of cosmic ray intensity with several crossings of the equator in the Atlantic Ocean, conducted during the 1954-1987 time period are analyzed to obtain the locations of the cosmic ray equator at different longitudes and epochs. These experimentally determined cosmic-ray-equator locations are compared with locations derived from simulated cosmic-ray intensities calculated as a function of the interpolated cutoff rigidity along the route of the survey. The rms difference between the experimental and calculated positions of the cosmic ray minima for all the surveys amounted to only 0.32 deg. These results confirm the results of Shea (1969) who showed that vertical cutoff rigidity is a reliable parameter in locating the cosmic ray equator, even though large differences exist between the cosmic ray equators for cosmic rays incident from different inclined directions.
Stoker Pieter H.
van der Walt A. J.
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