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Observations of Dispersionless Electron Injections

Observations of Dispersionless Electron Injections. E. Spanswick, E. Donovan, and R. Friedel. Motivation. Injections are a key element of the larger substorm process and are clearly related to processes at work in the “CD” region.

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Observations of Dispersionless Electron Injections

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  1. Observations of Dispersionless Electron Injections E. Spanswick, E. Donovan, and R. Friedel

  2. Motivation Injections are a key element of the larger substorm process and are clearly related to processes at work in the “CD” region. Injections are traditionally studied with LANL data – however the THEMIS conjunction meridian is over central Canada. 7 satellite constellation brackets CD & NENL regions. Additional information about injections in the Canadian sector would obviously be helpful to meeting the HEMIS mission objectives. Emma Spanswick – UCB – December 2005

  3. Motivation • How large is the initial injection region (radial extent) ? • Where is the initial injection region formed? • How can we maximize our ability to address such questions on a case by case basis during THEMIS? Ground-Based Identification of the Injection Region Can we identify dispersionless injections from the ground? Emma Spanswick – UCB – December 2005

  4. “nearly continuously correlated data sets(riometer and geostationary electron measurements)” High Energy Particle Dynamics - Injections Riometer Absorption >30KeV Electron Flux (geosynchronous) Baker et al. 1981 Emma Spanswick – UCB – December 2005

  5. High Energy Particle Dynamics Total Flux Criteria • Substorm Associated • 3 min. “rise time” • raised flux for > 15min Dispersionless Injection Emma Spanswick – UCB – December 2005

  6. Dispersionless Injections via the Riometers What about azimuthally ?? Simultaneous Injection (within 5sec. 1 data point) Emma Spanswick – UCB – December 2005

  7. Dispersionless Injections via the Riometers North – South  appears in only one riometer East – West  can appear in two riometers simultaneously Ribbon Shaped Region Initially Outside of 9 Re Expansion inwards & outwards Emma Spanswick – UCB – December 2005

  8. Summary LANL satellites can locate the azimuthal edges of the injection region (both electron and ion) Emma Spanswick – UCB – December 2005

  9. Correlation between integrated electron flux and riometer absorption is potentially a method for determining the ionospheric footpoints of THEMIS satellites. Summary LANL satellites can locate the azimuthal edges of the injection region (both electron and ion) Riometers can provide radial and azimuthal information about the initial onset, extent and expansion from within the injection region. Emma Spanswick – UCB – December 2005

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