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Near-transyear in solar magnetism
G Cornélissen1, K Otsuka, F Halberg
1Halberg Chronobiology Center, University of Minnesota, MMC 8609, 420 Delaware Street SE, Minneapolis, MN 55455, USA. corne001@umn.edu
Biomedicine & Pharmacotherapy = Biomedecine & Pharmacotherapie
|November 9, 2005
Summary
This study reveals distinct time structures in solar magnetism and solar activity. Solar magnetism exhibits a near-transyear period of 1.05 years, differing from solar activity
Area of Science:
- * Solar Physics and Helioseismology
- * Time Series Analysis
Background:
- * Daily solar magnetism data from May 1975 to April 2002 were analyzed.
- * The study compares the temporal characteristics of solar magnetism with solar activity (Wolf numbers).
Purpose of the Study:
- * To investigate the time structure of solar magnetism.
- * To compare solar magnetism's temporal patterns with those of solar activity.
- * To identify and characterize periodic components, particularly near-transyear cycles.
Main Methods:
- * Linear-nonlinear rhythmometry was employed for time series analysis.
- * Analysis focused on identifying periodicities and harmonic content in solar data.
Main Results:
- * A common ~27-day component (solar rotation) exists in both magnetism and activity, but with different harmonic content.
- * Solar activity shows a ~10-year component, absent in solar magnetism.
- * A near-transyear period of ~1.05 years was detected in solar magnetism.
- * Solar activity displayed a longer near-transyear period (~1.10 years), potentially linked to a ~0.9-year component and ~10-year modulations.
Conclusions:
- * Solar magnetism and solar activity possess unique temporal signatures.
- * The ~1.05-year cycle in solar magnetism is a significant finding.
- * Differences in periodic components highlight distinct underlying physical processes.
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