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Interplanetary magnetic field periodicity of ∼153 days
Author(s) -
Cane H. V.,
Richardson I. G.,
von Rosenvinge T. T.
Publication year - 1998
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 - 10.1029/1998gl900208
Subject(s) - interplanetary magnetic field , physics , interplanetary spaceflight , solar wind , magnitude (astronomy) , maxima , solar cycle , astrophysics , field (mathematics) , magnetic field , field strength , solar physics , atmospheric sciences , computational physics , geophysics , art , quantum mechanics , performance art , pure mathematics , art history , mathematics
We report on the finding of a 153‐day periodicity in the magnetic field strength and solar wind speed measured at 1 AU during the years 1978–1982. The period and the occurence epoch are consistent with the “154‐day” periodicity previously reported for events occurring at the Sun. In particular, the variations in the field strength and the occurence rate of energetic (tens of MeV) solar particle events are in phase. The similar periodicities in the interplanetary field and solar phenomena are consistent with a global phenomenon. Whereas this periodicity is quite strong for the magnetic field magnitude, there is only a weak periodicity for the individual field components. The field magnitude shows essentially no periodicity at this period during the previous and following solar maxima. The lack of persistence, and of significant harmonic components of the observed periodicity, does not support the proposal of a solar “clock” mechanism. The most significant variations in the complete near‐earth magnetic field data base (1963–1997) with periods of less than 200 days occur at 166 and 146 days.