Physics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.7623a&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Aug. 1, 1985, p. 7623-7627.
Physics
9
Annual Variations, Galactic Cosmic Rays, Heliosphere, Interplanetary Magnetic Fields, Solar Activity Effects, Northern Hemisphere, Particle Flux Density, Solar Wind
Scientific paper
An analysis of the annual and semiannual variation of the galactic cosmic ray intensity has been performed for the period 1953-1979 by using the data from the Climax and Dourbes neutron monitors. The analysis, based on a method for searching periodicities and recurrences in the cosmic ray intensity, has confirmed the existence of such variations and their phase changes associated with the reversals of the solar magnetic dipole. The importance in the cosmic ray transport of transverse diffusion arising from drift effects due to the curvature and gradient of the interplanetary magnetic field is confirmed, since this is the mechanism which can explain the dependence on the solar magnetic cycle. A phase advance of the semiannual variation is observed, which can be explained through the modulation of the heliolatitude distribution of cosmic rays by the activity of the solar magnetic regions migrating in both hemispheres toward the equator, during the 11-year cycle of solar activity.
Antonucci Ester
Attolini M. R.
Cecchini Simone
Galli Marcello
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