网站首页  > 学术活动  > 学术报告
学术活动
学术报告
What controls the global morphology of planetary aurora?
报告题目:What controls the global morphology of planetary aurora?
报 告  人:Associate Prof. Binzheng Zhang (the University of Hong Kong)
报告时间:2024-04-26 10:00:00
报告地点:Room 402, Astronomy Building
Abstract: Planetary magnetic fields control energetic particles in their space environments and guide particles to polar atmospheres to produce stunning auroral forms. As revealed by spacecraft measurements at the Earth, Saturn and Jupiter, the pathways of energetic particles to these planetary polar atmospheres are diverse, suggesting different coupling processes between their ionospheres and magnetospheres. These planets all have dipole-dominated magnetic fields, rotate in the same direction and are blown by solar wind, but what controls the global-scale patterns of energy dissipation, remains unknown. Based on three-dimensional magnetohydrodynamics calculations, we reveal that the competition between planet-driven plasma rotation and solar wind-driven flow convection determines the structure of global auroral morphologies. This unified theoretical framework can reproduce polar aurora from the Earth-type to Jupiter-type, via transition states that are strikingly consistent with the highly variable aurora patterns at Saturn. This generalised description of fundamental magnetospheric physics, proposed here and validated by decades-long observations, is applicable to exoplanetary systems.   

Bio:
2018-present: Associate Professor, Department of Earth Sciences, the University of Hong Kong
2016-2017: Postdoc Fellow, High Altitude Observatory, NCAR
2012-2015: Research Scientist, Thayer School of Engineering, Dartmouth College
B.S. in Electric Engineering, Zhejiang University, 2005, Hangzhou, China
M.S. in Electric Engineering, Zhejiang University, 2007, Hangzhou, China
Ph.D in Engineering Sciences, Dartmouth College, 2012, Hanover, NH, USA