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ACE

ACE. LANL. Alaska chain. Storm. orbit. overview. 0935-0955. 0947-0951 overview. Selected interval: 0947 – 0951 UT AE ~ 1000 nT; Cluster is located at (-16.41, 8.01, 0.52) R E in GSM and repeatedly crosses the neutral sheet;

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ACE

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  1. ACE

  2. LANL

  3. Alaska chain

  4. Storm

  5. orbit

  6. overview

  7. 0935-0955

  8. 0947-0951 overview Selected interval: 0947 – 0951 UT • AE ~ 1000 nT; • Cluster is located at (-16.41, 8.01, 0.52) RE in GSM and repeatedly crosses the neutral sheet; • Bx traces are in agreement with s/c separation along ZGSM; • The order of traces remains the same during NS and SN crossings: no rotations in the Y-Z plane; • Bipolar variation of Bz; • Flow reversal (TE).

  9. X-line detection From 4-point magnetic field measurements: • Magnetic field components in the Cluster barycentre: 4 traversals. • CurlB components: Y-component is positive and dominates over the interval; • divB vary in the range +/–10 nT/103 km; • X-component of the magnetic field curvature dominates; • Flow and field line curvature reversal; • X-line moves tailward over Cluster.

  10. X-line CS structure • Thin slightly bifurcated CS around X-line, j~16nA/m2, ha~500 km; • Bifurcated current sheet on both outflow regions.

  11. Reconnection & Hall Effect Earth Tail • Hall effect (By) during ‘outer’ crossings shows ion – electron decoupling Runov, A. R. Nakamura, W. Baumjohann, R. A. Treumann, T. L. Zhang, M. Volwerk, Z. Vörös, A. Balogh, K.-H. Glaßmeier, B. Klecker, H. Rème, and L. Kistler, Current sheet structure near magnetic X-line observed by Cluster, Geoph. Res. Lett., 2003 Wolfgang Baumjohann, IWF Graz

  12. 0947-0951 Bxyz, Vxyz, N

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