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arXiv · 2409.14752

Deconstructing the Properties of Solar Super Active Region 13664 in the Context of the Historic Geomagnetic Storm of 2024 May 10-11

Priyansh Jaswal·Suvadip Sinha·Dibyendu Nandy
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Abstract

The impact of solar-stellar activity on planetary environments is a topic of great interest within the Sun-Earth system as well as exoplanetary systems. In particular, extreme events such as flares and coronal mass ejections have a profound effect on planetary atmospheres. In May this year, a magnetic active region on the Sun (AR 13664) -- with a size exceeding hundred times that of Earth -- unleashed a large number of high energy X-class flares and associated mass ejections. The resulting Earth impact (geomagnetic storm) on May 10-11 was the strongest in the last two decades. We perform the first comprehensive analysis of the magnetic properties of the active region that spawned these flares and identify this to be a super active region with very rare physical characteristics. We also demonstrate how the rate of energization of the system is related to the flaring process. Our work illuminates how flare productive super active regions on the Sun and stars can be identified and what are their salient physical properties. Specifically, we put AR 13664 in historical context over the cumulative period of 1874 May-2024 June. We find that AR 13664 stands at 99.95 percentile in the distribution of area over 1874 May-2024 June, and at 99.10 percentile in terms of flux content among all ARs over the period 1996 April-2024 June. Our analysis indicates that five of its magnetic properties rank highest among all ARs recorded in SHARP data series during 2010 May-2024 June by the Solar Dynamic Observatory. Furthermore, we demonstrate that AR 13664 reached its most dynamic flare productive state following a rapid rate of rise of its flare-relevant parameters and that the X-class flares it spawned were more frequent near their peak values. Our analyses establish AR 13644 to be solar super active region and provide a paradigm for investigating their flare-relevant physical characteristics.

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Priyansh Jaswal, Suvadip Sinha, Dibyendu Nandy. 2025-01-14. Deconstructing the Properties of Solar Super Active Region 13664 in the Context of the Historic Geomagnetic Storm of 2024 May 10-11. https://doi.org/10.3847/1538-4357%2Fad960b

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