於益群 (教授)

教授 博士生导师 硕士生导师

性别:女

出生年月:1983-01-17

毕业院校:美国密歇根大学

学位:博士

所在单位:空间与环境学院

学科:地球物理学

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  • Congratulations to my former Postdoc Research Associate Ms. Shreedevi PR, for publishing her recent work in the Journal of Geophysical Research-Space Physics. 




  • On August 8, 2020,  Dong Wei successfully defended his PhD thesis: "Study on the coupling of mid- and high-latitude ionosphere and magnetosphere". 


    Congratulations! Dr. Wei! 


    8/2020



  • From July 21 to July 23, 2020, graduate students in our team attended the virtual GEM meeting held on the other side of the Earth. The meeting started around midnight and lasted until sunrise. Students overcame the challenges and presented their work. 


    Good job everyone!  


    07/2020




  • Shreedevi PR, a postdoc in our research team, was awarded the "Research Fund for International Young Scientist" by the NSFC. Congratulations!


    The project is "Onset and characteristics of Sub Auroral Polarization Streams (SAPS) during COronal Mass Ejections (CMEs) and Corotating Interaction Regions (CIRs) during geomagnetic storms".


    08/2019



  • PhD student Dong Wei recently published a GRL paper on "The Magnetospheric Driving Source of Double-Peak Subauroral Ion Drifts: Double Ring Current Pressure Peaks". Congratulations! 


    Double-peak subauroral ion drifts (DSAIDs), characterized by two high-speed flow channels, is a newly identified flow structure in the subauroral ionosphere. He et al. (2016, https://doi.org/10.1002/2016GL069133) proposed that two region 2 field-aligned currents (R2 FACs) might cause the DSAIDs. However, the underlying physical process that drives the double R2 FACs is unknown. This study reports a DSAIDs event and reveals its magnetospheric drivers. Defense Meteorological Satellite Program F18 satellite observed DSAIDs in the duskside subauroral region, which corresponded well to two low-density troughs and two R2 FACs. The Van Allen Probe B demonstrated that intense substorm ion injections recurrently occurred prior to the formation of DSAIDs, suggesting a potential magnetospheric driver of DSAIDs. Simulation confirms that recurrent ion injections intensify the partial ring current and create double pressure peaks in the near-Earth dusk-to-midnight region, leading two R2 FACs to flow into the ionosphere. The two R2 FACs are thus responsible for the DSAIDs formation. This study unveils the generation mechanism of DSAIDs and deepens the knowledge of the complex magnetosphere-ionosphere system.


    7/2019



  • Yu's recent study on "Initial Results From the GEM Challenge on the Spacecraft Surface Charging Environment" was selected by the Journal of Space Weather as a cover image. It is also reported as a Science Highlight on the home page of Los Alamos National Laboratry, where Yu worked before and collaborated with the team for this study. 


    4/2019