AI 中文总结
该研究挑战外辐射带季节变化源于局地几何效应的传统观点，证实冕洞太阳风的周期性重现及其阿尔文特性驱动外辐射带电子通量变化，建立了太阳与磁层多尺度动力学的统一框架。
AI 中文摘要
地球被两个高度动态的同心粒子辐射带环绕，外辐射带在太阳活动周、季节和27天（卡林顿）时标上表现出相干变化。太阳活动周和卡林顿变化已归因于冕洞太阳风的周期性重现，而季节变化长期以来被解释为调制太阳风-磁层耦合的局地几何效应。本文挑战这一范式，表明冕洞太阳风的周期性重现同样驱动季节变化，还证明该太阳风的阿尔文特性是观测到的外辐射带电子通量增强的原因。这些发现提供了一个统一框架，将太阳磁场拓扑、太阳风特性与地球及更远处多尺度的磁层动力学联系起来。
英文摘要
Earth is surrounded by two highly dynamic concentric belts of particle radiation. The outer radiation belt exhibits coherent variability at solar-cycle, seasonal, and 27-day (Carrington) timescales. While the solar-cycle and Carrington variations have been attributed to the recurrence of coronal hole solar wind, the seasonal variation has long been explained by local geometric effects that modulate the solar wind-magnetosphere coupling. Here, we challenge this paradigm by showing that the periodic recurrence of coronal hole solar wind likewise drives the seasonal variation. We further demonstrate that the Alfvénic nature of this solar wind is responsible for the observed electron flux enhancement in the outer radiation belt. These findings provide a unifying framework linking solar magnetic topology, solar wind properties, and magnetospheric dynamics across multiple timescales at Earth and beyond.
