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Multi-flux-rope system in solar active regions

Published online by Cambridge University Press:  24 September 2020

Yijun Hou Open the ORCID record for Yijun Hou [Opens in a new window] ,
Jun Zhang ,
Ting Li  and
Shuhong Yang Open the ORCID record for Shuhong Yang [Opens in a new window]
Yijun Hou
Affiliation:
CAS Key Laboratory of Solar Activity, National Astronomical Observatories Chinese Academy of Sciences, Beijing100101, China University of Chinese Academy of Sciences, Beijing100049, China email: yijunhou@nao.cas.cn
Jun Zhang
Affiliation:
CAS Key Laboratory of Solar Activity, National Astronomical Observatories Chinese Academy of Sciences, Beijing100101, China University of Chinese Academy of Sciences, Beijing100049, China email: yijunhou@nao.cas.cn
Ting Li
Affiliation:
CAS Key Laboratory of Solar Activity, National Astronomical Observatories Chinese Academy of Sciences, Beijing100101, China University of Chinese Academy of Sciences, Beijing100049, China email: yijunhou@nao.cas.cn
Shuhong Yang
Affiliation:
CAS Key Laboratory of Solar Activity, National Astronomical Observatories Chinese Academy of Sciences, Beijing100101, China University of Chinese Academy of Sciences, Beijing100049, China email: yijunhou@nao.cas.cn
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Abstract

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Magnetic flux rope (MFR) is closely connected with solar eruptions, such as flares and coronal mass ejections. The classical scenario assumes a single MFR for each eruption, but it is reasonable to expect multiple MFRs in a complex active region (AR). Statistically investigating AR 11897, we verify the existence of multiple MFR proxies during the AR evolution. Recently, AR 12673 in 2017 September produced the two largest flares in Solar Cycle 24. The evolutions of the AR magnetic fields and the two large flares reveal that significant flux emergence and successive interactions between different emerging dipoles resulted in the formations of multiple MFRs and twisted loop bundles, which successively erupted like a chain reaction within several minutes before the peaks of the two flares. We propose that the eruptions of a multi-flux-rope system can rapidly release enormous magnetic energy and result in large flares in solar AR.

Keywords

Sun: activitySun: atmosphereSun: filamentsSun: flaresSun: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S354: Solar and Stellar Magnetic Fields: Origins and Manifestations , June 2019 , pp. 443 - 447
Copyright
© International Astronomical Union 2020

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