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Statistics of Nonlinear Chorus-ECH Interactions in the Inner Magnetosphere & 近日太阳风双向离子回旋波的观测与激发机制

报告题目:Statistics of Nonlinear Chorus-ECH Interactions in the Inner Magnetosphere

报告人:刘斯 教授(长沙理工大学)

报告摘要:Chorus and electron cyclotron harmonics (ECH) in Earth's magnetosphere are crucial emissions, typically observed outside the plasmasphere near the magnetic equator. Studies indicate that the nonlinear interactions between chorus and ECH waves can generate ECH sidebands. Statistical analyses based on Van Allen Probes data reveal that this interaction predominantly occurs on the nightside region near the magnetic equator. As the AE index increases, the observed spatial distribution and intensity of ECH sidebands exhibit significant enhancement. The root-mean-square (RMS) amplitude of these sidebands scales proportionally with the square root of the product of the Chorus and ECH wave amplitudes. Furthermore, ECH sidebands effectively broaden the resonant electron energy range to approximately 10 eV, influencing radiation belt dynamics.

报告题目:近日太阳风双向离子回旋波的观测与激发机制

报告人:史晨 博士(长沙理工大学)

报告摘要:离子回旋波被认为在日冕加热和太阳风加速中具有重要作用,但该波动的产生机制尚不明晰。报告人基于帕克太阳探测器在近日太阳风中的观测数据,报道了一个下带为右旋偏振、上带为左旋偏振的双带波事件。双带波出现时质子束和核双成分均呈现出清晰的垂直温度大于平行温度特征。基于拟合速度分布函数得到的等离子体参数开展不稳定性研究,结果显示下带波本质上是由质子束回旋不稳定性激发的日向离子回旋波,受外流太阳风的多普勒效应影响表现为向外传播的右旋波动;上带波是本质上是由质子核回旋不稳定性激发的向外传播的离子回旋波。对质子束温度各向异性不稳定性的深入研究显示,该不稳定性会优先激发日向离子回旋波,观测上会因多普勒效应表现为右旋波动,因而提出太阳风中右旋波新的产生机制。本报告还将介绍双向离子回旋波激发机制的最新研究进展。

报告时间:2025年8月28日(周四)9:30

报告地点:仙林园区3-402会议室

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