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Solar mean magnetic...
Solar mean magnetic field variability: A wavelet approach to Wilcox Solar Observatory and SOHO/Michelson Doppler Imager observations
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- Boberg, Fredrik (författare)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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Lundstedt, Henrik (författare)
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Hoeksema, J T (författare)
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Scherrer, P H (författare)
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Liu, W (författare)
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(creator_code:org_t)
- 2002
- 2002
- Engelska.
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Ingår i: Journal of Geophysical Research. - 2156-2202. ; 107:A10: 1318
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http://dx.doi.org/10...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- coronal mass ejections
- Solar magnetic field
- active regions
- wavelet analysis
- internal rotation
Publikations- och innehållstyp
- art (ämneskategori)
- vet (ämneskategori)
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