[IGPP Everyone] Reminder - Friday - Spring Quarter - Space Physics Seminar - Fri. April 9 , 2021 - 3:30pm -

[Marjorie Sowmendran]

SPACE PHYSICS SEMINAR 

DEPARTMENT OF EARTH, PLANETARY, AND SPACE SCIENCES 
DEPARTMENT OF ATMOSPHERIC AND OCEANIC SCIENCES 
UNIVERSITY OF CALIFORNIA, LOS ANGELES 



Join Zoom Meeting 

https://ucla.zoom.us/j/96663537686?pwd=bXVLSVFrU2g5T0dsU2lMQTFtOW5yUT09 

Meeting ID: 966 6353 7686; Passcode: 981246 



Electron Only Reconnection 


Mark Hubbert 
Department of Earth, Planetary, and Space Sciences 
University of California, Los Angeles 



The Earth’s magnetotail contains a current sheet separating the anti-Sunward field of the southern lobe from the sunward-pointing northern lobe. Herein, we report tail current sheets that are supported only by electron currents. We examine 19 electron-only current sheets and 154 traditionally reconnecting current sheets in detail. Three current sheets are interpreted in terms of the time-evolution of reconnection onset. These events display a transition from a pre-reconnection current sheet to a traditional “electron-ion” reconnecting current sheet. Ground-based and in-situ data show that electron-ion reconnection frequently occurs shortly after electron-only reconnection. We then compare solar wind driving, tail plasma, and geomagnetic features of traditional reconnection events to those of electron-only reconnection events. We find that solar wind driving and geomagnetic features of electron-only reconnection are identical to those of traditional reconnection. However, we find significant differences in tail field and plasma features of the two reconnection types. This suggests two things: 1. electron-only reconnection can act as a precursor to electron-ion reconnection, and 2. Electron-only reconnection occurs in different contexts in Earth’s magnetotail. 





Friday, April 9, 2020 

3:30 - 5:00 PM 

In-Charge: C. T. Russell 





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