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On the Near-One-Year Variation of the Sun’s Mean Magnetic Field

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Abstract

The mean magnetic field (MMF) of the Sun-as-a-star was measured over the last 38 years by six observatories (about 17 000 MMF daily records, 1968 – 2005). The MMF power spectrum reveals the presence of an enigmatic 1.029(7) year periodicity whose origin requires explanation. We show that this quasi-annual variation is not produced by modulation of the MMF signal due to the annual change of the Earth’s helio-latitude (one-year change of visibility of the Sun’s polar regions) as commonly accepted. The nature of this new solar phenomenon is open for discussion.

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Correspondence to V. A. Kotov.

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Kotov, V.A. On the Near-One-Year Variation of the Sun’s Mean Magnetic Field. Sol Phys 239, 461–474 (2006). https://doi.org/10.1007/s11207-006-0146-x

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  • DOI: https://doi.org/10.1007/s11207-006-0146-x

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