Long-term changes in the solar diurnal variation

Details Long-term changes in the solar diurnal variation Long-term changes in the solar diurnal variation

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icrc...10..186f&link_type=abstract

IN: International Cosmic Ray Conference, 18th, Bangalore, India, August 22-September 3, 1983, Late Papers. Volume 10 (A85-22801

Computer Science

Particle Flux Density, Solar Cosmic Rays, Solar Flux Density, Annual Variations, Corotation, Diurnal Variations, Periodic Variations, Solar Cycles

Scientific paper

Deep River and Goose Bay neutron data, taken over a wide range of bands of the primary rigidity spectrum, are averaged to study the secular changes of the cosmic-ray solar diurnal variation. A dominant 11-year periodicity wave was observed, with the upper limiting rigidity varying in a 22-year cycle, thus contradicting the present conception of the 22-year vector being directed along the local direction of the interplanetary magnetic field. Furthermore, the angle made by the 22-year wave with the 11-year wave is found to be substantially larger than 38 deg, though less than 90 deg. Based on previous data from the surface and underground muon monitors at Hobart, Tasmania (1958), it is suggested that the radial component at high rigidities may be different in origin from that at lower rigidities.

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