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Diurnal and Eleven‐ Year Variations of Neutron Component of Cosmic Rays
Author(s) -
Bishara A. A.,
Azzam A. A.,
Darwish A. A.
Publication year - 1989
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19895010407
Subject(s) - cosmic ray , physics , rigidity (electromagnetism) , neutron monitor , neutron , astrophysics , diurnal temperature variation , variational method , energy spectrum , computational physics , nuclear physics , atmospheric sciences , quantum mechanics
Cosmic ray ground observations are used together with the method of coupling coefficients to determine, by spectrographic method, the features of the variational primary energy spectrum of diurnal and eleven‐year variations of neutron component of cosmic rays. It is found that the variational energy spectrum responsible for both types of variations can be best described by a constant spectrum up to an upper effective rigidity boundary. The upper cut‐off effective rigidity boundary for the variational energy spectrum of diurnal variation was found to change from 105 GV at maximum solar activity to 15.85 GV at minimum solar activity. For Eleven‐year variation, R max was found to have a value of about 20 GV which changes slighly with solar activity due to the change of the coupling coefficients with solar activity.