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Energetic Electron Bursts in the Magnetotail

Energetic Electron Bursts in the Magnetotail. J. B. Blake Space Sciences Department The Aerospace Corporation. Electron Bursts - Cluster/RAPID. Electron bursts routinely seen in magnetotail Global size cannot be determined by Cluster constellation

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Energetic Electron Bursts in the Magnetotail

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  1. Energetic Electron Bursts in the Magnetotail J. B. Blake Space Sciences Department The Aerospace Corporation Polar PI Telecon 26 August 2005

  2. Electron Bursts - Cluster/RAPID • Electron bursts routinely seen in magnetotail • Global size cannot be determined by Cluster constellation • Use Polar and other s/c at large separation distances • Show example that occurred on 27 August 2001 Polar PI Telecon 26 August 2005

  3. Substorm on 27 Aug 2001 • Isolated substorm • Classic dispersed injection • Injection studied by Li et al. (2003) • Occurred at 04:08 UT and at an LT of 20:40 • Event also by Baker et al. (2002) using a variety of satellite and ground assets Polar PI Telecon 26 August 2005

  4. Spacecraft Locations • GEO s/c shown at time of substorm • Magnetotail s/c positions shown for first six hours of day • White spot at time of substorm Polar PI Telecon 26 August 2005

  5. Polar Cluster Chandra • The three magnetotail s/c see burst at the same time, more than 10 minutes after energetic particle injection at GEO • Several precursor bursts also in time coincidence Polar PI Telecon 26 August 2005

  6. Polar Cluster Time History Polar PI Telecon 26 August 2005

  7. Polar Cluster Prior to Substorm Polar PI Telecon 26 August 2005

  8. Polar Cluster Timing Polar PI Telecon 26 August 2005

  9. Onset at Cluster 1 • Energy dispersion not present Polar PI Telecon 26 August 2005

  10. Cluster • Bursts isotropic • Substrom particles peaked • Polar • Butterfly distribution in radiation belt • Isotropic at boundary • Bursts isotropic • Substorm particles butterfly Polar PI Telecon 26 August 2005

  11. Polar Chandra Timing Polar PI Telecon 26 August 2005

  12. GEO Chandra Timing • Clearly shows delay between GEO injection and time of electron arrival at Chandra • Chandra near LT of GEO injection Polar PI Telecon 26 August 2005

  13. Summary • Energetic electrons ( > 35 keV) appear abruptly and at irregular intervals on tail field lines, broadly distributed in latitude and local time • Tail motion, expansion by itself not attractive • Local acceleration - why global distribution? • Leakage of radiation belt particles • Large reservoir of particles, widely spaced • Simple explanation for hard spectra frequently seen Polar PI Telecon 26 August 2005

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