[IGPP Everyone] SPACE SCIENCE SEMINAR - Spring Quarter - 3:30pm -Friday May 22, 2020 - CCLE Zoom

[Marjorie Sowmendran]

SPACE PHYSICS SEMINAR 




USE THE CCLE ZOOM LINK PROVIDED BELOW 








https://ccle.ucla.edu/mod/zoom/view.php?id=2939559 





Date/Time: May 22, 2020/ 03:30 PM Pacific Time (US and Canada) 







SPACE PHYSICS SEMINAR 

DEPARTMENT OF EARTH, PLANETARY, AND SPACE SCIENCES 

DEPARTMENT OF ATMOSPHERIC AND OCEANIC SCIENCES 

UNIVERSITY OF CALIFORNIA, LOS ANGELES 

(AOS M275B, EPSS M288B) 




Observations and Impressions of Electron-Only Reconnection in Earth’s Magnetotail 
Mark Hubbert 


Department of Earth, Planetary, and Space Sciences, UCLA 







Abstract: Magnetic reconnection occurs throughout the Solar System and transfers energy from the magnetic field to the surrounding plasma. One observational characteristic indicative of “traditional” magnetic reconnection in Earth’s magnetotail is electron exhaust outflow embedded in larger scale ion exhaust outflow. The ongoing Magnetosphere Multiscale (MMS) mission has the proper spatial separation/configuration to analyze electron-scale physics in the context of magnetic reconnection. In 2018, Phan et al. used MMS to observe a reconnecting electron-scale current sheet in Earth’s magnetosheath that featured electron exhaust outflows but lacked the ion exhaust outflows expected in “traditional” reconnection. That same year, Wang et al. observed a similar phenomenon in the plasma sheet of Earth’s magnetotail. This process has been deemed “Electron-Only Reconnection” or “Electron Reconnection” due to the electron-scale thickness of the reconnecting current sheet and the lack of ion response observed during these intervals. Although recent simulations have successfully generated “electron-only reconnection” as a product of sub-ion scale plasma turbulence, its physical mechanism in Earth’s magnetotail remains unclear. In this seminar, we show additional MMS observations of “electron-only reconnection” in Earth’s magnetotail, compare their features, and pose a physical mechanism that is consistent with our observations. 




Friday May 22, 2020 




In-charge: C. T. Russell 






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