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第五讲：Mapping the Sun’s Far-side Magnetic Flux and Understanding Sunquake Events
Local helioseismology provides a unique tool to monitor the Sun’s far-side active regions using only the near-side observations. Recently, we developed a machine-learning method to convert the helioseismic images of far-side active regions, which are actually travel-time deficits of p-mode waves, into far-side magnetic-flux maps. These maps provide useful information for space weather forecasting and global-scale coronal field modeling. In this talk, I will also present a recent observation of a sunquake event, which was excited by the X9.3 flare in 2017 and caused an unprecedented “magnetic-field sunquake” event. I then discuss why some strong flares can generate sunquake events while some others cannot.
Dr. Junwei Zhao is a Senior Research Scientist at W. W. Hansen Experimental Physics Laboratory of Stanford University. He got his Bachelor and Master of Science degrees from Department of Astronomy, Nanjing University, and Ph.D. degree from Department of Physics, Stanford University. He has been a member of the SOHO/MDI and SDO/HMI teams for more than 20 years. He is a helioseismologist working on the Sun’s subsurface flows, meridional circulation, and far-side imaging.