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

Boberg, Fredrik LU ; Lundstedt, Henrik ; Hoeksema, J T ; Scherrer, P H and Liu, W (2002) In Journal of Geophysical Research 107(A10: 1318).
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.
Please use this url to cite or link to this publication:
author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
coronal mass ejections, Solar magnetic field, active regions, wavelet analysis, internal rotation
in
Journal of Geophysical Research
volume
107
issue
A10: 1318
publisher
Wiley-Blackwell
external identifiers
  • wos:000180353900053
  • scopus:41749119669
ISSN
2156-2202
DOI
10.1029/2001JA009195
language
English
LU publication?
yes
id
548416a0-3232-4908-9ceb-9522e9dd9b31 (old id 119921)
date added to LUP
2016-04-01 12:28:08
date last changed
2025-10-14 10:19:55
@article{548416a0-3232-4908-9ceb-9522e9dd9b31,
  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.}},
  author       = {{Boberg, Fredrik and Lundstedt, Henrik and Hoeksema, J T and Scherrer, P H and Liu, W}},
  issn         = {{2156-2202}},
  keywords     = {{coronal mass ejections; Solar magnetic field; active regions; wavelet analysis; internal rotation}},
  language     = {{eng}},
  number       = {{A10: 1318}},
  publisher    = {{Wiley-Blackwell}},
  series       = {{Journal of Geophysical Research}},
  title        = {{Solar mean magnetic field variability: A wavelet approach to Wilcox Solar Observatory and SOHO/Michelson Doppler Imager observations}},
  url          = {{https://lup.lub.lu.se/search/files/2936020/623930.pdf}},
  doi          = {{10.1029/2001JA009195}},
  volume       = {{107}},
  year         = {{2002}},
}