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Origin of extreme solar eruptive activity from the active region NOAA 12673 and the largest flare of solar cycle 24

Published online by Cambridge University Press:  28 September 2023

Bhuwan Joshi Open the ORCID record for Bhuwan Joshi [Opens in a new window]  and
Prabir K. Mitra
Bhuwan Joshi
Affiliation:
Udaipur Solar Observatory, Physical Research Laboratory, Udaipur 313 001, India
Prabir K. Mitra
Affiliation:
Udaipur Solar Observatory, Physical Research Laboratory, Udaipur 313 001, India
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Abstract

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During 2017, when the Sun was moving toward the minimum phase of solar cycle 24, an exceptionally eruptive active region (AR) NOAA 12673 emerged on the Sun during August 28-September 10. During the highest activity level, the AR turned into a δ-type sunspot region, which manifests the most complex configuration of magnetic fields from the photosphere to the coronal heights. The AR 12673 produced four X-class and 27 M-class flares, along with numerous C-class flares, making it one of the most powerful ARs of solar cycle 24. Notably, it produced the largest flare of solar cycle 24, namely, the X9.3 event on 2017 September 6. In this work, we highlight the results of our comprehensive analysis involving multi-wavelength imaging and coronal magnetic field modeling to understand the evolution and eruptivity from AR 12673. We especially focus on the morphological, spectral and kinematical evolution of the two X-class flares on 6 September 2017. We explore various large- and small-scale magnetic field structures of the active region which are associated with the triggering and subsequent outbursts during the powerful solar transients.

Keywords

Sun: activitySun: coronaSun: coronal mass ejections (CMEs)Sun: flaresSun: magnetic fields
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S372: The Era of Multi-Messenger Solar Physics , August 2022 , pp. 62 - 69
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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