[IGPP Everyone] TODAY: Space Physics seminar - **REMOTE ONLY** 4/21, 3:30 PM PDT - Data-driven discovery of Fokker-Planck equation for the Earth's radiation belts electrons using Physics-Informed Neural Networks Abstract (E. Camporeale, NOAA)
Emmanuel V. Masongsong
emasongsong at igpp.ucla.edu
Thu Apr 21 10:18:40 PDT 2022
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
THURSDAY , April 2 1st , 2022
Data-driven discovery of Fokker-Planck equation for the Earth's radiation belts electrons using Physics-Informed Neural Networks
Enrico Camporeale
NOAA
We use the framework of Physics-Informed Neural Network (PINN) to solve the inverse problem associated to the Fokker-Planck equation for radiation belts' electron transport, using four years of Van Allen Probes data. Traditionally, reduced models have employed a diffusion equation based on the quasilinear approximation. We show that the dynamics of 'killer electrons' is described more accurately by a drift-diffusion equation, and that drift is as important as diffusion for nearly-equatorially trapped ~ 1 MeV electrons in the inner part of the belt. Moreover, we present a recipe for gleaning physical insight from solving the ill-posed inverse problem of inferring model coefficients from data using PINNs. Furthermore, we derive a parameterization for the diffusion and drift coefficients as a function of L only, which is both simpler and more accurate than earlier models. Finally, we use the PINN technique to develop an automatic event identification method that allows to identify times at which the radial transport assumption is inadequate to describe all the physics of interest.
THURSDAY, April 21st, 2022
**Remote Attendance Only**
3:30 - 4:30 PM
In-Charge: Vassilis Angelopoulos
Spring Space Physics Seminar schedule:
*THURSDAY* Apr 21 Enrico Camporeale, NOAA (REMOTE),
Data-driven discovery of Fokker-Planck equation for the Earth's radiation belts electrons using Physics-Informed Neural Networks
Apr 29 Artur Davoyan, UCLA Engineering
Light sailing for breakthrough space exploration
May 06 Frances Staples, UCLA AOS
Radiation Belt Dynamics from a Particle Perspective
May 12 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
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