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Solar Toroidal Field Evolution Spanning Four Sunspot Cycles

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Abstract/Contents

Abstract
Forty-four years of Wilcox Solar Observatory, 14 years of Michelson Doppler Imager on the Solar and Heliospheric Observatory, and 11 years of Helioseismic and Magnetic Imager on the Solar Dynamics Observatory magnetic field data have been studied to determine the east–west inclination—the toroidal component—of the magnetic field. Maps of the zonal averaged inclination show that each toroidal field cycle begins at around the same time at high latitudes in the northern and southern hemispheres, and ends at the equator. Observation of these maps also shows that each instance of a dominant toroidal field direction starts at high latitudes near sunspot maximum and is still visible near the equator well past the minimum of its cycle, indicating that the toroidal field cycle spans approximately two sunspot cycles. The length of the extended activity cycle is measured to be approximately 16.8 yr.

Description

Type of resource mixed material, Dataset, text
Date created [ca. September 1, 2021]
Date modified September 28, 2022; February 28, 2022; December 5, 2022
Publication date September 28, 2022; February 28, 2022

Creators/Contributors

Author Liu, Allison
Author Scherrer, Philip ORCiD icon https://orcid.org/0000-0002-6937-6968 (unverified)

Subjects

Subject solar cycle
Subject Torroidal field of Sun
Genre Mixed materials
Genre Data
Genre Text
Genre Data sets
Genre Dataset

Bibliographic information

Related item
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Shrauner, J. A., & Scherrer, P. H. 1994, SoPh, 153, 131, doi: 10.1007/BF00712496
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DOI https://doi.org/10.25740/yq160kn5895
Location https://purl.stanford.edu/yq160kn5895

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This work is licensed under a Creative Commons Attribution Non Commercial 4.0 International license (CC BY-NC).

Preferred citation

Liu, A. and Scherrer, P. (2022). Solar Toroidal Field Evolution Spanning Four Sunspot Cycles. Stanford Digital Repository. Available at https://purl.stanford.edu/yq160kn5895

Collection

Solar Physics Group Software and Data for Publications

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Contact information

scherrer@stanford.edu
pscherrer@solar.stanford.edu
aliu@sun.stanford.edu

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