[IGPP Everyone] Reminder - Friday - EPSS Space Physics seminar announcement - Friday October 8, 2021 - 03:30 PM Pacific Time (US and Canada)

[Sowmendran, Margie (IGPP)]

R E M I N D E R

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/92101918782?pwd=Z2o5RmI4OEpBWW4zcG1DZStIUWgrZz09


Energetic Electron Precipitation in Earth’s Radiation Belts: New Insights from ELFIN

Xiaojia Zhang
EPSS, UCLA

Dynamic flux variations in Earth’s electron radiation belts are controlled by concurrently operating acceleration and loss processes. Wave-particle resonant interaction contributes significantly to both processes, providing electron acceleration or precipitation to the atmosphere. Modern radiation belt models, which are largely based on near-equatorial spacecraft measurements, have been successful in explaining the long-term dynamics in energetic electron fluxes by electron diffusive scattering from low-intensity whistler-mode and electromagnetic ion cyclotron (EMIC) waves. Equatorial observations, however, cannot directly resolve the precipitating electrons inside the loss cone; such measurements of electron precipitation can be only performed by low-altitude spacecraft capturing electron fluxes to the atmosphere. In this presentation, we overview first results from UCLA’s ELFIN CubeSat Mission, which provides the first pitch-angle resolved energetic electron measurements at low altitudes. These measurements demonstrate both electron precipitation as predicted by the diffusion model and new patterns of precipitation related to non-diffusive (nonlinear) electron resonant interaction with whistler-mode waves.


Friday, October 8, 2021
3:30 - 5:00 PM

In-Charge:  Marco Velli
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