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The formation of the plasmapause: Dynamical simulations

The formation of the plasmapause: Dynamical simulations. V. Pierrard Belgian Institute for Space Aeronomy J. Lemaire (Plasmapause mechanism) J. Cabrera (IMAGE observations) F. Darrouzet (CLUSTER observations).

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The formation of the plasmapause: Dynamical simulations

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  1. The formation of the plasmapause: Dynamical simulations V. Pierrard Belgian Institute for Space Aeronomy J. Lemaire (Plasmapause mechanism) J. Cabrera (IMAGE observations) F. Darrouzet (CLUSTER observations)

  2. Mechanism of plasma instabilityKp increases  E increases in the morning sectorThe convection velocity increasesErosion of the plasmasphere in the post-midnight sector Formation of a plume Lemaire and Gringauz, The Earth’s plasmasphere, Cambridge University Press, 1998.

  3. Input: KpE5D equatorial electric field (McIlwain, 1986)Empirical model determined from observations of ATS5 and ATS6

  4. Dynamical simulationsPierrard and Lemaire, Geophys. Res. Lett., 31, 5, 2004. 9 June 2001 8h00

  5. 9 June 2001 16h00 23h00

  6. 10 June 2001 7h00

  7. 18 June 2001 13h00 -14h00- 15h00- 16h00

  8. 18 June 2001 18h0020h00

  9. May 2, 2001, 18h00 VERY QUIET June 26, 2000, 16h00 SUBSTORM June 25, 2000, 21h00 BETWEEN SUBSTORMS May 24, 2000, 9h00 STORM

  10. Kp – L relation • * Numerical simulations for constant Kp • - Linear relation from Carpenter and Anderson [1992] • + EUV/IMAGE Kp decrease • + EUV/IMAGE • Kp increase

  11. 08:32 UT 20:10 MLT 7.7-8.1 RE 08:30 UT 20:10 MLT 24 18 06 12 CLUSTER07 May 2002 MLT=20:00, Kpmax=3, small separation distance (~150km) Plume observed in the inbound pass at the same time WHISPER: Waves of High frequency and Sounder for Probing of Electron density by Relaxation

  12. 07 May 2002: Simulation, EUV and CLUSTER Equatorial projection of EUV image at 08:31 UT: Plume close to the same MLT sector (23-24)

  13. Conclusions • Simulations based on the instability mechanism • Use the Kp dependent electric field model E5D • Shoulders and plumes are associated to particular Kp evolutions. • The position of the plasmapause depends on Kp and its evolution with time. • Comparisons with IMAGE give similar structures in the same LT sector.

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