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Source of a prominent poleward surge during Solar Cycle 24.

Yeates, A.R. and Baker, D. and van Driel-Gesztelyi, L. (2015) 'Source of a prominent poleward surge during Solar Cycle 24.', Solar physics., 290 (11). pp. 3189-3201.

Abstract

As an observational case study, we consider the origin of a prominent poleward surge of leading polarity, visible in the magnetic butterfly diagram during Solar Cycle 24. A new technique is developed for assimilating individual regions of strong magnetic flux into a surface-flux transport model. By isolating the contribution of each of these regions, the model shows the surge to originate primarily in a single high-latitude activity group consisting of a bipolar active region present in Carrington Rotations 2104 – 05 (November 2010 – January 2011) and a multipolar active region in Rotations 2107 – 08 (February – April 2011). This group had a strong axial dipole moment opposed to Joy’s law. On the other hand, the modelling suggests that the transient influence of this group on the butterfly diagram will not be matched by a large long-term contribution to the polar field because it is located at high latitude. This is in accordance with previous flux-transport models.

Item Type:Article
Keywords:Active regions, Magnetic fields, Photosphere, Solar cycle, Models.
Full text:(NA) Not Applicable
Download PDF (arXiv version)
(591Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1007/s11207-015-0660-9
Publisher statement:The final publication is available at Springer via http://dx.doi.org/10.1007/s11207-015-0660-9
Record Created:11 Aug 2015 16:50
Last Modified:29 Feb 2016 16:38

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