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Cluster Workshop VI, 1-3 October, 2003 ESTEC

A.Vaivads, B. N. Rogers, M. Andr é , S. Buchert, N. Cornilleau-Wehrlin, A. Eriksson, A. Fazakerley, Y. Khotyaintsev, A. Lahiff, B. Lavraud, T. Phan. Cluster Workshop VI, 1-3 October, 2003 ESTEC. Narrow current sheets and lower hybrid turublence at the magnetopause.

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Cluster Workshop VI, 1-3 October, 2003 ESTEC

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  1. A.Vaivads, B. N. Rogers, M. André, S. Buchert, N. Cornilleau-Wehrlin, A. Eriksson, A. Fazakerley, Y. Khotyaintsev, A. Lahiff, B. Lavraud, T. Phan Cluster Workshop VI, 1-3 October, 2003ESTEC • Narrow current sheets and • lower hybrid turublence • at the magnetopause

  2. Cluster and magnetopause scales • Intro • Cluster • MP crossing • E~jxB • Separatrix • Waves • Summary

  3. Small scales and waves,what we want to know? • Structure? sheet vs tube local vs global dispersion relation • Transport plasma energy (particles, Poynting flux) • Momentum equationGeneralized Ohm’s law free energy • Energy conversion j·E • Intro • Cluster • MP crossing • E~jxB • Separatrix • Waves • Summary

  4. Density dip ~1c/wpi • Narrow current sheet (yellow) 5-10le,re • Strongest E fields within the current sheet • Differences among s/c in E and B. • Intro • Cluster • MP crossing • E~jxB • Separatrix • Waves • Summary

  5. Intro • Cluster • MP crossing • E~jxB • Separatrix • Waves • Summary

  6. Intro • Cluster • MP crossing • E~jxB • Separatrix • Waves • Summary

  7. Generalized Ohms law and Cluster • Intro • Cluster • MP crossing • E~jxB • Separatrix • Waves • Summary

  8. E~j x B, all 4 s/c • Potential drop across the current sheet of a few 100 V • Intro • Cluster • MP crossing • E~jxB • Separatrix • Waves • Summary

  9. 5-10le,re current sheet,jperp and jII • B and n gradients coincides • E~j x B • pe not important • e- beam carrying jII can generate waves • Intro • Cluster • MP crossing • E~jxB • Separatrix • Waves • Summary

  10. Generalized Ohms law and Cluster • Intro • Cluster • MP crossing • E~jxB • Separatrix • Waves • Summary

  11. Reconnection in 2-fluid 2D MHD, Ey [Rogers] • Reconnection with a guide field • Width of separatrix is a few c/wpe • E is strong along the separatrix • E ~j x B along separatrix • dype small • Intro • Cluster • MP crossing • E~jxB • Separatrix • Waves • Summary

  12. Intro • Cluster • MP crossing • E~jxB • Separatrix • Waves • Summary

  13. Waves strongest in the narrow current sheet (gradient in n and B) • Broad band • Spectral peaks f~fLH • Spectral peaks f~100 Hz, ’whistlers’ • Poynting flux associated to both ’whistlers’ and ’LHD’ • Waves generated by gradients or electron beams? n E • Intro • Cluster • MP crossing • E~jxB • Separatrix • Waves • Summary E B S  S

  14. Intro • Cluster • MP crossing • E~jxB • Separatrix • Waves • Summary • 15-35 Hz band-pass filter (LH) • kre~1 • low coherence • wave transports e- across the current sheet. • D10-9 m2/s, Diffusion?

  15. Summary • Strongest E (10s mV/m) within narrow current sheets ~10 c/wpeon magnetospheric side of MP • E~jxB, pe is not important • Separatrix of reconnection Other explanations? • Strong lower hybrid drift waves and whistlers • Electron transport due to LHD waves can be important only within the current sheet • D 109 m2/s, diffusion? • Intro • Cluster • MP crossing • E~jxB • Separatrix • Waves • Summary

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