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Source of a Prominent Poleward Surge During Solar Cycle 24

Yeates, AR; Baker, D; van Driel-Gesztelyi, L; (2015) Source of a Prominent Poleward Surge During Solar Cycle 24. Solar Physics , 290 (11) pp. 3189-3201. 10.1007/s11207-015-0660-9. Green open access

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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.

Type: Article
Title: Source of a Prominent Poleward Surge During Solar Cycle 24
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/s11207-015-0660-9
Publisher version: http://doi.org/10.1007/s11207-015-0660-9
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Active Regions, Magnetic Fields; Magnetic fields, Photosphere; Solar Cycle, Models
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/1466827
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