The magnetic field environment of active region 12673 that produced the energetic particle events of September 2017
Stephanie L. Yardley, Lucie M. Green, Alexander W. James, David, Stansby, Teodora Mihailescu

TL;DR
This study examines the magnetic environment of active region 12673 to understand its role in producing solar energetic particle events, focusing on magnetic configurations, CME behavior, and magnetic connectivity to Earth.
Contribution
It provides a detailed analysis of the magnetic field environment of AR 12673 and its influence on SEP production, highlighting the importance of magnetic topology and CME expansion.
Findings
SEP-productive events involve null point reconnection or CME expansion into open field
Fast CMEs (>1500 km/s) are associated with SEP events
Magnetic connectivity and CME propagation influence SEP escape and detection
Abstract
Forecasting solar energetic particles (SEPs), and identifying flare/CMEs from active regions (ARs) that will produce SEP events in advance is extremely challenging. We investigate the magnetic field environment of AR 12673, including the AR's magnetic configuration, the surrounding field configuration in the vicinity of the AR, the decay index profile, and the footpoints of Earth-connected magnetic field, around the time of four eruptive events. Two of the eruptive events are SEP-productive (2017 September 4 at 20:00~UT and September 6 at 11:56~UT), while two are not (September 4 at 18:05~UT and September 7 at 14:33~UT). We analysed a range of EUV and white-light coronagraph observations along with potential field extrapolations and find that the CMEs associated with the SEP-productive events either trigger null point reconnection that redirects flare-accelerated particles from the…
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Taxonomy
TopicsSolar and Space Plasma Dynamics · Ionosphere and magnetosphere dynamics · Earthquake Detection and Analysis
