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Title:
Solar mean magnetic field variability: A wavelet approach to Wilcox Solar Observatory and SOHO/Michelson Doppler Imager observations
Authors:
Boberg, Fredrik; Lundstedt, Henrik; Hoeksema, J. Todd; Scherrer, Philip H.; Liu, Wei
Publication:
Journal of Geophysical Research (Space Physics), Volume 107, Issue A10, pp. SSH 15-1, CiteID 1318, DOI 10.1029/2001JA009195 (JGRA Homepage)
Publication Date:
10/2002
Origin:
AGU
AGU Keywords:
Solar Physics, Astrophysics, and Astronomy: Solar activity cycle (2162), and Astronomy: Solar and stellar variability, and Astronomy: Instruments and techniques, and Astronomy: Magnetic fields,
Abstract Copyright:
(c) 2002: American Geophysical Union
DOI:
10.1029/2001JA009195
Bibliographic Code:
2002JGRA..107.1318B

Abstract

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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