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Solar flare-CME association

Published online by Cambridge University Press:  28 September 2023

Ting Li Open the ORCID record for Ting Li [Opens in a new window]
Ting Li*
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China; mailto:[email protected]@nao.cas.cn School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China
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Abstract

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We carry out the first statistical study that investigates the flare-coronal mass ejections (CMEs) association rate as function of the flare intensity and the total unsigned magnetic flux (ΦAR) of ARs that produces the flare. Our results show that flares of the same GOES class but originating from an AR of larger ΦAR, are much more likely confined. This implies that ΦAR is a decisive quantity describing the eruptive character of a flare, as it provides a global parameter relating to the strength of the background field confinement. We also calculated the mean twist values α in regions close to the polarity inversion line and proposed a new parameter α / ΦAR to measure the probability for a large flare to be associated with a CME. We find that the new parameter α/ ΦAR is well able to distinguish eruptive flares from confined flares.

Keywords

Sun: activitySun: flaresSun: coronal mass ejections (CMEs)Sun: 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. 49 - 61
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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