Solar mean magnetic field variability: A wavelet approach to Wilcox Solar Observatory and SOHO/Michelson Doppler Imager observations | Zendy

Boberg Fredrik | Zendy; Lundstedt Henrik | Zendy; Hoeksema J. Todd | Zendy; Scherrer Philip H. | Zendy; Liu Wei | Zendy

Open Access

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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