AI 中文总结
研究2024年3月28日NOAA 13615活动区M7.0耀斑，利用多波长观测和非线性无力场外推法，发现爆发与核心场和上覆反螺旋度系统重联密切相关，为反螺旋度重联致太阳磁场失稳提供观测证据。
AI 中文摘要
携带相反自螺旋度的日冕磁系统之间的磁重联可能在太阳爆发中起作用，但观测证据仍然有限。我们利用多波长观测和非线性无力场外推法研究了2024年3月28日美国国家海洋和大气管理局13615活动区的一次M7.0耀斑。重建的日冕场显示，在一个相反符号的上覆磁系统下方有一个低洼的正螺旋度核心场。在爆发期间，这两个磁系统的足点连通性发生了显著变化：扎根于西部足点区域的场线从正螺旋度变为负螺旋度，正螺旋度区域大幅减少。这些变化伴随着远程色球层增亮、从源区向远程色球层增亮延伸的间歇性极紫外条纹状增亮、随后大规模日冕环的形成以及位于核心场一个足点的微弱外部硬X射线源。这些结果共同表明，这次爆发与核心场和上覆反螺旋度系统之间的重联密切相关，为反螺旋度重联可导致爆发性太阳磁场失稳提供了观测证据。
英文摘要
Magnetic reconnection between coronal magnetic systems carrying opposite self-helicity may play a role in solar eruptions, but observational evidence remains limited. We investigate an M7.0 flare in NOAA Active Region 13615 on 2024 March 28 using multiwavelength observations and nonlinear force-free field extrapolations. The reconstructed coronal field reveals a low-lying positive-helicity core field beneath an overlying magnetic system of opposite sign. During the eruption, the footpoint connectivity of these two magnetic systems changes markedly: field lines rooted in the western footpoint region change from positive to negative helicity, and the positive-helicity domain is substantially reduced. These changes are accompanied by a remote chromospheric brightening, intermittent EUV stripe-like brightenings extending from the source region toward the remote chromospheric brightening, the subsequent formation of large-scale coronal loops, and a weak outer hard X-ray source located at a footpoint of the core field. Together, these results suggest that the eruption was closely associated with reconnection between the core field and the overlying counter-helicity system, providing observational evidence that counter-helicity reconnection can contribute to the destabilization of eruptive solar magnetic fields.
CommentsAccepted for publication in The Astrophysical Journal
