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Ulysses observations of short‐period (≤30 Days) modulation of the galactic cosmic rays
Author(s) -
Blake J. B.,
Looper M. D.,
Keppler E.,
Heber B.,
Kunow H.,
Quenby J. J.
Publication year - 1997
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 - 10.1029/97gl00129
Subject(s) - period (music) , cosmic ray , modulation (music) , astrophysics , physics , astronomy , cosmic cancer database , acoustics
A frequency analysis of the short‐period modulation of the GCR as seen by instruments aboard Ulysses shows interesting temporal variations. In particular, during an approximate five‐month period from December 1993 to May 1994, the modulation was not the usual 26 days but more than 29 days. The CIR‐associated MeV ions did not exhibit this period shift.