Physics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.330..353d&link_type=abstract
Nature (ISSN 0028-0836), vol. 330, Nov. 26, 1987, p. 353, 354.
Physics
3
Solar Atmosphere, Solar Flux, Solar Neutrinos, Solar Oscillations, Solar Cycles, Stellar Evolution, Sunspots
Scientific paper
Attention has been devoted recently to possible time variations in the neutrino flux data, and some investigators have found an inverse correlation with the 11-year sunspot cycle. Here the authors present a calculation of the inventory of positron emitters in the Earth's atmosphere that results from hadronic cascades initiated by galactic cosmic rays, and the variation of this source of low-energy neutrinos with the 11-year solar cycle. Their results rule out the possibility that cosmogenic neutrino emitters are responsible for an apparent solar-cycle dependence. As atmospheric secondary-particle decay was previously eliminated as a significant neutrino source, any such variations, if corroborated over the next sunspot cycle, would appear to be caused by phenomena outside the Earth's atmosphere, most likely in the Sun itself.
de la Zerda A.
O'Brien Kieran
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