[IGPP Everyone] NOW: Space Physics seminar - Friday 5/13, 3:30 PM PDT - Contribution of Kinetic Alfvén Waves to Energetic Electron Scattering and Precipitation from Plasma Sheet Injections (Y. Shen, UCLA EPSS)

[Emmanuel Masongsong]

SPACE PHYSICS SEMINAR 




DEPARTMENT OF EARTH, PLANETARY, AND SPACE SCIENCES 

DEPARTMENT OF ATMOSPHERIC AND OCEANIC SCIENCES 
UNIVERSITY OF CALIFORNIA, LOS ANGELES 

ZOOM LINK PROVIDED BELOW 


https://ucla.zoom.us/j/98070654630?pwd=aWdrSktueG9xWjU3cDZiQUhGRXV0UT09 



Contribution of Kinetic Alfvén Waves to Energetic Electron Scattering and Precipitation from Plasma Sheet Injections 


Yangyang Shen 
UCLA EPSS 
Energetic electron scattering and precipitation from the Earth's plasma sheet to the ionosphere is an important contributor to magnetosphere-ionosphere coupling. This seminar will discuss the role of kinetic Alfvén waves (KAWs) in energetic electron scattering and precipitation associated with plasma sheet injection and dipolarization. Using two examples featuring conjugate observations between the ELFIN, MMS, and THEMIS missions, we present evidence of tens to hundreds of keV electron precipitation to the ionosphere potentially driven by KAWs. Taking into account electron bounce motion and guiding-center drifts, test particle simulations illustrate the Doppler-shifted Landau resonant interaction between injected electrons and KAWs at dipolarization-front magnetic field gradients. Injection electrons undergo efficient pitch-angle scattering on the time scales of seconds, resulting in energetic electron precipitation to the ionosphere consistent with observations.. 


Friday, May 13th, 2022 

In-person in Slichter 3853, with refreshments afterwards on Franz Patio 
3:30 - 4:30 PM 



In-Charge: Vassilis Angelopoulos 



Spring Space Physics Seminar schedule: 


May 13 Yangyang Shen, UCLA EPSS 
Contribution of kinetic Alfvén waves to energetic electron scattering and precipitation from plasma sheet injections 


May 20 Mike Hartinger, UCLA EPSS, SSI 
Inter-Hemispheric Comparisons of Mesoscale Current Systems through Expanded Antarctic Instrument Networks 


May 27 Man Hua, UCLA AOS 
Radiation belt electron dynamics driven by VLF transmitter waves in near-Earth space 


June 03 Adam Kellerman, UCLA AOS 
Modeling Earth's Radiation Belt Electrons on Shorter Time Scales 




-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.igpp.ucla.edu/pipermail/everyone/attachments/20220513/3fb48fcb/attachment.html>