太阳风间断面触发磁层顶重联
Triggering the magnetopause reconnection by solar wind discontinuities
AI总结：
本研究结合多航天器观测与全球混合模拟，揭示太阳风旋转间断面与磁层顶切向间断面相互作用可触发磁重联并导致等离子体混合，该机制或可推广至其他恒星风环境。
摘要：
磁重联是空间等离子体中最普遍的过程之一，负责带电粒子加速、等离子体族群的混合与加热。本文研究一种重联触发过程，该过程由两类间断面的相互作用驱动：太阳风旋转间断面与地球磁层边界（磁层顶）处的切向间断面。通过结合多航天器观测与全球混合模拟，我们表明太阳风间断面可以驱动磁层顶重联，并在太阳风流的远下游区域造成磁层顶附近太阳风与磁层等离子体的混合。由于大振幅间断面在太阳风中频繁被观测到，并且理论预测其存在于各类恒星风中，我们关于间断面—间断面相互作用驱动重联的结果可能在磁层之外具有广泛的应用价值。
英文摘要：
Magnetic reconnection is one of the most universal processes in space plasma that is responsible for charged particle acceleration, mixing and heating of plasma populations. In this paper we consider a triggering process of reconnection that is driven by interaction of two discontinuities: solar wind rotational discontinuity and tangential discontinuity at the Earth's magnetospheric boundary, magnetopause. Combining the multispacecraft measurements and global hybrid simulations, we show that solar wind discontinuities may drive the magnetopause reconnection and cause the mixing of the solar wind and magnetosphere plasmas around the magnetopause, well downstream of the solar wind flow. Since large-amplitude discontinuities are frequently observed in the solar wind and predicted for various stellar winds, our results of reconnection driven by the discontinuity-discontinuity interaction may have a broad application beyond the magnetosphere.
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