Beer, J, Tobias, SM and Weiss, NO (2018) On long-term modulation of the Sun’s magnetic cycle. Monthly Notices of the Royal Astronomical Society, 473 (2). pp. 1596-1602. ISSN 0035-8711
Abstract
We utilize reconstructions based on cosmogenic radionuclides as well as direct observations of solar magnetic activity, to argue that the solar dynamo has operated similarly to the present day for at least the past 10 000 yr. The persistence of the 87-yr Gleissberg cycle throughout supermodulation events suggests that the Hale and Schwabe cycles continue independently of the modulational mechanism for activity. We further analyse behaviour of solar activity during the Spörer and Maunder Minima. Such grand minima recur with the characteristic de Vries period of approximately 208 yr but their incidence is modulated by the Hallstatt cycle with a characteristic period of around 2300 yr.We ascribe the latter to supermodulation, caused by breaking the symmetry of the dynamo pattern. Finally, we emphasize the need for further calculations in order to determine the effects of changes in solar field morphology and symmetry on the solar wind and on cosmic ray deflection.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. This article has been published in Monthly Notices of the Royal Astronomical Society. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | dynamo; magnetic fields; sunspots |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mathematics (Leeds) > Applied Mathematics (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 08 Sep 2017 14:00 |
Last Modified: | 15 Mar 2018 03:51 |
Status: | Published |
Publisher: | Oxford University Press |
Identification Number: | 10.1093/mnras/stx2337 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:120982 |