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Solar mean magnetic field variability: A wavelet approach to Wilcox Solar Observatory and SOHO/Michelson Doppler Imager observations
Author(s) -
Boberg Fredrik,
Lundstedt Henrik,
Hoeksema J. Todd,
Scherrer Philip H.,
Liu Wei
Publication year - 2002
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2001ja009195
Subject(s) - observatory , coronal mass ejection , physics , solar observatory , wavelet , doppler effect , solar rotation , astrophysics , astronomy , solar minimum , solar physics , geodesy , remote sensing , magnetic field , solar cycle , solar wind , geology , quantum mechanics , artificial intelligence , computer science
Solar mean magnetic field (SMMF) measurements from the Wilcox Solar Observatory and with the SOHO/MDI instrument are described and analyzed. Even though two completely different methods of observation are used, the two data sets obtained show a strong similarity. Using continuous wavelet transforms, SMMF variability is found at a number of temporal scales. Detected SMMF signals with a 1–2 year period are considered to be linked to variations in the internal rotation of the Sun. Intermediate SMMF oscillations with a period of 80–200 days are probably connected to the evolution of large active regions. We also find evidence for 90 min variations with coronal mass ejections as a suggested origin.

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