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学术报告

[2019-12-18,Terry Z. Liu 刘子谞] Particle acceleration by transient structures around Earth’s bow shock

DEC
17

Upstream of Earth’s bow shock, the foreshock is filled with particles that have been reflected at the bow shock and are streaming away from it. Interaction of these particles with solar wind particles and discontinuities within this region can cause foreshock transients to form. Downstream of Earth’s bow shock, localized magnetosheath jets with high dynamic pressure are frequently observed. When such a fast magnetosheath jet compresses the ambient magnetosheath plasma, an earthward compressional bow wave/shock can form. Here I present that foreshock transients and magnetosheath jets can accelerate particles through shock drift acceleration, Fermi acceleration, and the betatron acceleration. Foreshock transients and magnetosheath jets therefore can increase the particle acceleration efficiency of the parent shock by providing additional acceleration. The shock environment relevant for particle acceleration is not just the shock itself, but also the nonlinear transient structures both upstream and downstream of it.

[2019-11-20,申成龙 教授] 日冕物质抛射相互作用及其引起的行星际复杂结构

NOV
18

日冕物质抛射相互作用是日地空间中广泛存在的一种现象。已有研究表明,日冕物质抛射的相互作用可能显著影响他们的空间天气效应,包括(1)相互作用引起传播速度和方向的改变进而影响对地有效性;(2)相互作用导致南向磁场增强进而改变地磁效应;(3)相互作用引起的拓扑结构变化等导致高能粒子事件增强。

[2019-05-21,董川飞] 恒星(太阳)与行星相互作用:磁场、大气损失和生命前化学

MAY
20

讲座时间:周二(5月21日)下午3点
讲座嘉宾:董川飞,普林斯顿大学
讲座题目:恒星(太阳)与行星相互作用:磁场、大气损失和生命前化学
讲座地点:北京大学物理楼北415

[2019-05-16,Eric Donovan 教授] The SMILE Mission - the First-Ever Experiment to Track the Drivers of Space Weather

MAY
14

讲座时间:周四(5月16日)下午3点
讲座嘉宾:Eric Donovan, University of Calgary
讲座题目:The SMILE Mission - the First-Ever Experiment to Track the Drivers of Space Weather
讲座地点:北京大学物理楼北415

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