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Is there a twenty year wave in the dirunal anisotropy of cosmic rays?
Author(s) -
Ahluwalia H. S.
Publication year - 1988
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl015i004p00287
Subject(s) - anisotropy , cosmic ray , amplitude , neutron monitor , physics , geology , muon , telescope , conjunction (astronomy) , astrophysics , optics , nuclear physics
We have analyzed data obtained with the Deep River neutron monitor and the underground vertical muon telescope at Embudo for the period 1965–79. Our data in conjunction with other published data show that for 1957–70 the diurnal anisotropy is unidirectional; with direction along 18 hour LT (east‐west). During 1971–79, the diurnal anisotropy consists of two components. One is in east‐west direction and the other is the radial component, with direction along 12 hour LT. The latter attains a maximum amplitude in 1976. We find no evidence for the existence of the twenty year wave in the diurnal anisotropy of cosmic rays.