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Summer School Alpbach 2002 Plasma Entry into the Magnetosphere

Summer School Alpbach 2002 Plasma Entry into the Magnetosphere. Götz Paschmann MPE/ISSI. 3D View of the Magnetosphere. First Magnetopause Crossing, 1961. MP as Tangential (a) vs. Rotational (b) Discontinuity. Magnetopause with Cluster at 100 km Separation. Cluster at 100 km.

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Summer School Alpbach 2002 Plasma Entry into the Magnetosphere

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  1. Summer School Alpbach 2002Plasma Entry into the Magnetosphere Götz Paschmann MPE/ISSI

  2. 3D View of the Magnetosphere

  3. First Magnetopause Crossing, 1961

  4. MP as Tangential (a) vs. Rotational (b) Discontinuity

  5. Magnetopause with Cluster at 100 km Separation Cluster at 100 km

  6. Density Gradients at MP: WHISPER Data

  7. Bi-Directional Jets Seen by EQS and GTL

  8. Magnetosphere Topology & Flows

  9. Cluster Observes Reconnection Jets Cluster Reconnection Jets

  10. Walen Tests

  11. Cluster Observes Nearly Continuous Reconnection Almost Continuous Reconnection

  12. Transient Reconnection

  13. Flux Transfer Events Sporadic, localised reconnection between the magnetosheath and magnetospheric fields….. …..creates 2 tubes of magnetic flux peeling back across the dayside magnetopause…. …..allowing magnetosheath plasma to enter the magnetosphere along the flux tube…. …..and magnetospheric plasma to escape. CJ Owen et al., MSSL

  14. Walen Test for FTE

  15. Plasma Depletion & Magnetic Flux PileupAMPTE-IRM

  16. Plama Transfer Across the Magnetopause

  17. The Cusp in the 1982 Cluster Proposal

  18. C3 12 CuspEntry Cusp SuperDarn MHD Cluster C3 Ion Geotail + 10mn IMF 15:00 15:30 16:00 16:30 17:00 17:30 18:00 Time UT (HH:MM)

  19. Geoeffective Solar Wind

  20. Reconnected Flux Bundle for IMF-By > 0

  21. Lrec Cusp H = H0 sin q/2 H0 Erec q/2 H0 Cusp Flux – Polar Cap Potential Relation Contribution to polar cap potential: Particle flux into the magnetosphere: [Hill, 1979]

  22. For nsh = 15 cm-3, Bsh = 20 nT, H0 = 10 RE : Example: For a = 0.1, Lrec = 40 RE: Previous estimates: 1026 s-1

  23. Z Lsw Esw q/2 Hsw rec Esw q/2 View from Sun Hsw Bsw In the solar wind: Cross-Section

  24. dmp Bbl Z R0 Vbl Y dbl View from the Sun Top View Diffusive Entry Schematic 2Hbl Terminator

  25. Diffusive EntryFlux across the Magnetopause: For D = 109 m2/s, nsh = 15 cm-3, nbl = 10 cm-3 dmp = 500 km, R0 = 15 RE : Transport in LLBL: For Hbl = 15 RE, Vbl = 200 km/s: 9 kV

  26. Burke et al., JGR, May, 1999: • sin2q/2 - dependence of Frec • base-potential F0 ? 25 keV Total polar-cap potential: FPC = Frec + F0 F0 = Fdiff - Fk Measured Potential BT 10.4 nT ¥ 6.1 nT +4.3 nT + 2.3 nT ~ 25 kV

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