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Energetic Particle Distribution and Effects on Magnetospheric Processes

This presentation discusses the distribution of energetic particles and their potential effects on magnetospheric processes. It explores the behavior of particles in the cusp region and their role in the formation of the ring current. The study also investigates the possible creation of cross polar-cap potential through charge separation. The presentation concludes with an exploration of the butterfly pitch angle distribution of electrons and ions, and the impact of locally mirroring particles.

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Energetic Particle Distribution and Effects on Magnetospheric Processes

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  1. Auxiliary slides

  2. ISEE-1

  3. ISEE-2

  4. ISEE-1

  5. ISEE-1 Energetic particle WAPS sensor B Locus of a = 90 degree pitch angles Will plot as a sinusoid on a latitude/longitude projection of the unit sphere

  6. 24 keV < E < 45 keV

  7. 63 keV < E < 95 keV

  8. 142 keV < E < 210 keV

  9. 24 keV < E < 45 keV

  10. 63 keV < E < 95 keV

  11. 142 keV < E < 210 keV

  12. Conclusions This and the another ISEE event described by Whitaker et al. [2006, 2007] are “smoking gun” events that establish that processes in the cusp accelerate particles in-situto ring current energies. The questions that now remain are what effects, if any, these particles have on magnetospheric processes? Are they the source of the ring current via gradient and curvature drifts to the nightside inner magnetosphere? Do these particles create, via charge separation, the cross polar-cap potential?

  13. The Butterfly Pitch Angle Distribution Particle intensity with respect to pitch angle Reduction of locally mirroring particles

  14. Protons Electrons Fritz, Space Science Reviews,Vol 95: 469-488, 2001.

  15. Energy 26 October 1999 Electron PADs • Electron intensities plotted as functions of both pitch angle and time • The butterfly depression occurs nearly simultaneously across the energy spectrum • Measured fluxes and the strength of the butterfly PAD are also nearly constant for all ten energy channels Klida and Fritz, Ann Geophys. Submitted 2007

  16. Energy 26 October 1999Ion PADs • Pronounced Butterfly PAD in the middle energy channels • As the energy range decreases, butterfly PAD onset is observed later • Multiple observed injections with intensities peaked at 90º pitch angle at lower energies • Overall decrease in total measured counts as the energy channel increases Klida and Fritz, Ann Geophys. Submitted 2007

  17. 26 October 1999 Ion PADs(15.6 keV to 35.4 keV) Klida and Fritz, Ann Geophys. Submitted 2007

  18. Starting position modeled backward in time Single Ion Modeling in a T96 Magnetosphere Initial Conditions Klida and Fritz, Ann. Geophys. Submitted 2007

  19. The extraterrestrial ring current: Consider the variation of the prep and parallel pressure terms in this formula with a variable cusp source

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