NDLI: Reversals of the Sun’s Polar Magnetic Fields in Relation to Activity Complexes and Coronal Holes

Content Provider	Springer Nature Link
Author	Mordviv, A. V. Yazev, S. A.
Copyright Year	2013
Abstract	A spatiotemporal analysis of long-term measurements of the Sun’s magnetic field was carried out to study changes in its zonal structure and reversals of the polar fields in Cycles 21 – 24. A causal relationship between activity complexes, their remnant magnetic fields, and high-latitude magnetic fields has been demonstrated in the current cycle. The appearance of unipolar magnetic regions near the poles is largely determined by the decay of long-lived activity complexes. The nonuniform distribution of sunspot activity and its north–south asymmetry result in the asymmetry of remnant fields that are transported poleward due to meridional circulation. The asymmetry of high-latitude magnetic fields leads to an asynchrony of polar-field reversals in both hemispheres. The interaction of high-latitude unipolar magnetic regions with the polar fields affects the embedded coronal holes. The evolution of large-scale magnetic fields was also studied in a time–latitude aspect. It is shown that regular reversals of the Sun’s polar fields resulted from cyclic changes in high-latitude magnetic fields. A triple polarity reversal of the polar fields in Cycle 21 and short-term polarity alternations at the poles were interpreted taking into account the interaction of the remnant fields with the Sun’s polar fields.
Starting Page	1971
Ending Page	1981
Page Count	11
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	289
Issue Number	6
e-ISSN	1573093X
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-12-10
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Active regions, magnetic fields Magnetic fields, photosphere Coronal holes Solar cycle, observations Astrophysics and Astroparticles Atmospheric Sciences Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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Decay of Activity Complexes, Formation of Unipolar Magnetic Regions, and Coronal Holes in Their Causal Relation

The Properties of the Tilts of Bipolar Solar Regions

Photospheric and Coronal Observations of Abrupt Magnetic Restructuring in Two Flaring Active Regions

Coronal Holes and Open Magnetic Flux over Cycles 23 and 24

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Using Polar Coronal Hole Area Measurements to Determine the Solar Polar Magnetic Field Reversal in Solar Cycle 24

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