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Source of a Prominent Poleward Surge During Solar Cycle 24

Yeates, A.R.; Baker, D.; van Driel-Gesztelyi, L.


D. Baker

L. van Driel-Gesztelyi


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.


Yeates, A., Baker, D., & van Driel-Gesztelyi, L. (2015). Source of a Prominent Poleward Surge During Solar Cycle 24. Solar Physics, 290(11), 3189-3201.

Journal Article Type Article
Acceptance Date Feb 14, 2015
Online Publication Date Feb 24, 2015
Publication Date Nov 1, 2015
Deposit Date Feb 27, 2015
Publicly Available Date Feb 24, 2016
Journal Solar Physics
Print ISSN 0038-0938
Electronic ISSN 1573-093X
Publisher Springer
Peer Reviewed Peer Reviewed
Volume 290
Issue 11
Pages 3189-3201
Keywords Active regions, Magnetic fields, Photosphere, Solar cycle, Models.
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