Near-continuous tracking of solar active region NOAA 13664 over three solar rotations

Abstract

Magnetic flux emergence and decay in the Sun span from days to months. However, their tracking is typically limited to about half a solar rotation when relying on single-vantage-point observations. Combining observations from both the Earth-facing and far side of the Sun, we monitored the magnetic and coronal evolution and characterised the non-potentiality of one of the most complex and eruptive regions of the past two decades, over more than three full solar rotations. We used photospheric magnetograms and EUV filtergrams from the Solar Orbiter and the Solar Dynamics Observatory along with flare detections from the GOES and the STIX instrument on board the Solar Orbiter. All images were deprojected into a common coordinate system and merged into a unified dataset. We tracked the evolution of magnetic flux and EUV emission and computed magnetic field parameters from the line-of-sight magnetograms to quantify the region's non-potentiality. We identified the region's initial emergence and followed its evolution through to its decay. The region developed through successive flux emergence episodes over a period of 20 days, reached its peak complexity one month after the first emergence, and gradually decayed over the subsequent two months. Unlike many complex regions, it consistently maintained high levels of non-potentiality for most of its lifetime, sustaining equally strong flaring activity. The derived time series of non-potentiality parameters, the first of their kind, far exceeded the typical 14-day window imposed by solar rotation and were remarkably consistent, exhibiting strong correlation with the flaring activity of the region. Multi-vantage-point observations can significantly improve our understanding of how magnetic flux emerges, evolves, and drives solar activity, beyond the two-week limit imposed by solar rotation on observations along the Sun-Earth line.

Accepted for publication in Astronomy & Astrophysics, 12 Pages, 7 figures

References in corpus (26)

• The Solar Orbiter mission -- Science overview
• The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: SHARPs -- Space-weather HMI Active Region Patches
• The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: Overview and Performance
• Magnetic Properties of Solar Active Regions that Govern Large Solar Flares and Eruptions
• Solar surface emerging flux regions: a comparative study of radiative MHD modeling and Hinode SOT observations
• The Solar Orbiter Science Activity Plan: translating solar and heliospheric physics questions into action
• The usefulness of analytic response functions
• Numerical Simulations of Flare-productive Active Regions: delta-sunspots, Sheared Polarity Inversion Lines, Energy Storage, and Predictions
• Non-neutralized electric currents in solar active regions and flare productivity
• SMARPs and SHARPs: Two Solar Cycles of Active Region Data
• Evaluating (and Improving) Estimates of the Solar Radial Magnetic Field Component from Line-of-Sight Magnetograms
• Activity Complexes and A Prominent Poleward Surge During Solar Cycle 24
• Average motion of emerging solar active region polarities I: Two phases of emergence
• The characteristics of flare- and CME-productive solar active regions
• Accuracy analysis of the on-board data reduction pipeline for the Polarimetric and Helioseismic Imager on the Solar Orbiter mission
• Magnetic fields inferred by Solar Orbiter: A comparison between SO/PHI-HRT and SDO/HMI
• Active Region Photospheric Magnetic Properties Derived from Line-of-sight and Radial Fields
• Using the STIX background detector as a proxy for GOES
• Deconstructing the Properties of Solar Super Active Region 13664 in the Context of the Historic Geomagnetic Storm of 2024 May 10-11
• Direct assessment of SDO/HMI helioseismology of active regions on the Sun's far side using SO/PHI magnetograms
• Unveiling Key Factors in the Solar Eruptions Leading to the Solar Superstorm in 2024 May
• Stereoscopic disambiguation of vector magnetograms: first applications to SO/PHI-HRT data
• The extremely strong non-neutralized electric currents of the unique solar active region NOAA 13664
• Analysis of a long-duration AR throughout five solar rotations: Magnetic properties and ejective events
• Characterizing the Umbral Magnetic Knots of $\delta$-Sunspots
• A prolific solar flare factory. Nearly continuous monitoring of an active region nest with Solar Orbiter