Asymmetric Solar Polar Field Reversals
The solar polar fields reverse because magnetic flux from decaying sunspots moves towards the poles, with a preponderance of flux from the trailing spots. Let us assume that there is a strong asymmetry in the sense that all activity is in the Northern Hemisphere, then that excess flux will move to t...
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ftdatacite:10.48550/arxiv.1207.2077 2023-05-15T18:22:08+02:00 Asymmetric Solar Polar Field Reversals Svalgaard, Leif Kamide, Yohsuke 2012 https://dx.doi.org/10.48550/arxiv.1207.2077 https://arxiv.org/abs/1207.2077 unknown arXiv https://dx.doi.org/10.1088/0004-637x/763/1/23 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences article-journal Article ScholarlyArticle Text 2012 ftdatacite https://doi.org/10.48550/arxiv.1207.2077 https://doi.org/10.1088/0004-637x/763/1/23 2022-04-01T13:38:24Z The solar polar fields reverse because magnetic flux from decaying sunspots moves towards the poles, with a preponderance of flux from the trailing spots. Let us assume that there is a strong asymmetry in the sense that all activity is in the Northern Hemisphere, then that excess flux will move to the North Pole and reverse that pole, while nothing happens in the South. If later on, there is a lot of activity in the South, then that flux will help reverse the South Pole. In this way, we get two humps in solar activity and a corresponding difference in time of reversals. Such difference was first noted by Babcock (1959) from the very first observation of polar field reversal just after the maximum of the strongly asymmetric solar cycle 19. At that time, the Southern Hemisphere was most active before sunspot maximum and the South Pole duly reversed first, followed by the Northern Hemisphere more than a year later, when that hemisphere was most active. Solar cycles since then have had the opposite asymmetry, with the Northern Hemisphere being most active early in the cycle. Polar field reversals for these cycles have as expected happened first in the North. This is especially noteworthy for the present solar cycle 24. We suggest that the association of two peaks of solar activity when separated by hemispheres with correspondingly different times of polar field reversals is a general feature of the cycle. Text South pole DataCite Metadata Store (German National Library of Science and Technology) Humps ENVELOPE(-57.450,-57.450,-63.983,-63.983) North Pole South Pole |
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DataCite Metadata Store (German National Library of Science and Technology) |
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Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences |
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Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences Svalgaard, Leif Kamide, Yohsuke Asymmetric Solar Polar Field Reversals |
topic_facet |
Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences |
description |
The solar polar fields reverse because magnetic flux from decaying sunspots moves towards the poles, with a preponderance of flux from the trailing spots. Let us assume that there is a strong asymmetry in the sense that all activity is in the Northern Hemisphere, then that excess flux will move to the North Pole and reverse that pole, while nothing happens in the South. If later on, there is a lot of activity in the South, then that flux will help reverse the South Pole. In this way, we get two humps in solar activity and a corresponding difference in time of reversals. Such difference was first noted by Babcock (1959) from the very first observation of polar field reversal just after the maximum of the strongly asymmetric solar cycle 19. At that time, the Southern Hemisphere was most active before sunspot maximum and the South Pole duly reversed first, followed by the Northern Hemisphere more than a year later, when that hemisphere was most active. Solar cycles since then have had the opposite asymmetry, with the Northern Hemisphere being most active early in the cycle. Polar field reversals for these cycles have as expected happened first in the North. This is especially noteworthy for the present solar cycle 24. We suggest that the association of two peaks of solar activity when separated by hemispheres with correspondingly different times of polar field reversals is a general feature of the cycle. |
format |
Text |
author |
Svalgaard, Leif Kamide, Yohsuke |
author_facet |
Svalgaard, Leif Kamide, Yohsuke |
author_sort |
Svalgaard, Leif |
title |
Asymmetric Solar Polar Field Reversals |
title_short |
Asymmetric Solar Polar Field Reversals |
title_full |
Asymmetric Solar Polar Field Reversals |
title_fullStr |
Asymmetric Solar Polar Field Reversals |
title_full_unstemmed |
Asymmetric Solar Polar Field Reversals |
title_sort |
asymmetric solar polar field reversals |
publisher |
arXiv |
publishDate |
2012 |
url |
https://dx.doi.org/10.48550/arxiv.1207.2077 https://arxiv.org/abs/1207.2077 |
long_lat |
ENVELOPE(-57.450,-57.450,-63.983,-63.983) |
geographic |
Humps North Pole South Pole |
geographic_facet |
Humps North Pole South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://dx.doi.org/10.1088/0004-637x/763/1/23 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1207.2077 https://doi.org/10.1088/0004-637x/763/1/23 |
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1766201492939735040 |