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Radiation Belt Electron Transport & Energization

Radiation Belt Electron Transport & Energization. Slot region. outer belt. inner belt. Mary K. Hudson, Magnetospheric Thrust Participants. Coupled Modeling Scheme. Solar Cycle of SAMPEX 2-6 MeV Electrons. Li et al., GRL, 2006. Response to Solar Wind Forcing.

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Radiation Belt Electron Transport & Energization

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  1. Radiation Belt Electron Transport & Energization Slot region outer belt inner belt Mary K. Hudson, Magnetospheric Thrust Participants

  2. Coupled Modeling Scheme

  3. Solar Cycle of SAMPEX 2-6 MeV Electrons Li et al., GRL, 2006

  4. Response to Solar Wind Forcing • 2-3 day lag at Geo Paulikas & Blake, 1979 • Prompt peak L ~3 Vassiliadis et al., 2003 SAMPEX/Vsw correlation 2-6 MeV fluxes

  5. ULF Wave-Relativistic Electron Correlation Rostoker et al., GRL, 1998

  6. Direct Coupling of Solar Wind ULF Waves Kepko & Spence, JGR, 2003 Or Convective Growth Magnetopause K-H Waves Miura, JGR, 1992; Claudepierre et al., JGR, 2008 LFM time series analysis

  7. Halloween ’03 2-6 and >10 MeV Electrons See filling of slot region on storm timescale (days) at 2-6 MeV (Baker et al., 2004) SAMPEX observes > 2 month delay in high > 10 MeV fluxes at low altitude (longer loss time)

  8. Halloween ’03 Shock Injection LFM-test particle simulation • W ~ 5 MeV  15 MeV • R ~ 6 RE  2.5 RE E = - B/t : Bz/t E Kress et al., JGR, 07

  9. Halloween ’03 Shock Injection of >10 MeV (W0=1-7 MeV) Electrons Kress et al., 2006

  10. Low altitude SAMPEX observations at > 10 MeV electrons, injected 10/29/03 Looper et al., ‘06 Simulated pitch angle distribution-> Kress et al., 2006

  11. MHD Fields Inject RadBelt Electrons Plasmasheet el injection  Elkington et al., JASTP, 2004

  12. MHD Fields Injection of RadBelt Electrons Elkington et al., JASTP, 2004

  13. PSD calculations for other storms… September 1998 (final) January 1995 • The (big) September 1998 storm shows a significant change in trapped PSD as a result of coupling to the plasmasheet. • The more moderate storm of January 1995 showed almost no coupling with the plasmasheet. Elkington et al., 2008

  14. Diffusion Rates vs. L Radial diffusion rates in model ULF wave fields D_LL ~ LN Perry et al., JGR, 05, includes δEφ, δBr, δB//, freq and L-dependent power • Radial diffusion rates in • model ULF wave fields • DLL ~ D0LN # # ULF wave DLL studies: Elkington et al., 2003; Ukhorskiy et al., 2005; Fei et al., 2006 Tau(L,E) Summers 04; Tau = days/Kp Shprits 05 Braughtigam & Albert, 2000, N = 10; Perry et al., 2006

  15. F. Chu et al., AGU, F 07 • = 1000 MeV/G ↑ Radial Diffusion for Nov 04 Storm Baker et al., GRL, 07

  16. July & Nov 04 Differ by SSC

  17. Plasmapause Control of Electron Flux Peak and Slot Region Local accel and pitchangle scattering due to VLF/ELF waves (Whistler, EMIC) Shprits et al., JASTP 2008

  18. Magnetospheric SEP Simulations SEP Cutoffs: Brian Kress poster

  19. SEP Cutoff rigidities calculated in a CISM CMIT simulation of 14 May 1997 storm IGRF field embedded within MHD inner boundary

  20. Handoff to Forecast Transition • Radial diffusion model with DLLdetermined by LTR ULF wave power tabulated by vsw or Kp switch • SEP cutoffs in solar-wind parametrized MHD field snapshots • Neither involve pushing millions of particles in time-dependent MHD fields in real time using appropriate input spectra; • Given input spectra, e.g. SEPs from COHREL+parametrized shock model SEP cutoffs • Given continuously available geo fluxes radbelt f at peak flux, typically L~3-4 at 2-6 MeV, determined from radial diffusion code including time-dependent plasmapause loss term

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