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Multispacecraft observation of magnetic cloud erosion by magnetic reconnection during propagation

Ruffenach, A. ; Lavraud, B. ; Owens, M. J. ; Sauvaud, J.-A. ; Savani, N. P. ; Rouillard, A. P. ; Démoulin, P. ; Foullon, C. ; Opitz, A. ; Fedorov, A. ; Jacquey, C. J. ; Génot, V. ; Louarn, P. ; Luhmann, J. G. ; Russell, C. T. ; Farrugia, C. J. ; Galvin, A. B.

Journal of Geophysical Research, 2012-09, Vol.117 (A9), p.n/a [Periódico revisado por pares]

Washington, DC: Blackwell Publishing Ltd

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  • Título:
    Multispacecraft observation of magnetic cloud erosion by magnetic reconnection during propagation
  • Autor: Ruffenach, A. ; Lavraud, B. ; Owens, M. J. ; Sauvaud, J.-A. ; Savani, N. P. ; Rouillard, A. P. ; Démoulin, P. ; Foullon, C. ; Opitz, A. ; Fedorov, A. ; Jacquey, C. J. ; Génot, V. ; Louarn, P. ; Luhmann, J. G. ; Russell, C. T. ; Farrugia, C. J. ; Galvin, A. B.
  • Assuntos: Astronomy ; Astrophysics ; coronal mass ejection ; Earth and Planetary Astrophysics ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; magnetic cloud ; magnetic flux rope ; Physics ; Planetology ; Sciences of the Universe ; solar wind ; Space ; Sun
  • É parte de: Journal of Geophysical Research, 2012-09, Vol.117 (A9), p.n/a
  • Notas: istex:BF3686E1D0980ECF176C4A60BC0C0A9D9351725C
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  • Descrição: During propagation, Magnetic Clouds (MC) interact with their environment and, in particular, may reconnect with the solar wind around it, eroding away part of its initial magnetic flux. Here we quantitatively analyze such an interaction using combined, multipoint observations of the same MC flux rope by STEREO A, B, ACE, WIND and THEMIS on November 19–20, 2007. Observation of azimuthal magnetic flux imbalance inside a MC flux rope has been argued to stem from erosion due to magnetic reconnection at its front boundary. The present study adds to such analysis a large set of signatures expected from this erosion process. (1) Comparison of azimuthal flux imbalance for the same MC at widely separated points precludes the crossing of the MC leg as a source of bias in flux imbalance estimates. (2) The use of different methods, associated errors and parametric analyses show that only an unexpectedly large error in MC axis orientation could explain the azimuthal flux imbalance. (3) Reconnection signatures are observed at the MC front at all spacecraft, consistent with an ongoing erosion process. (4) Signatures in suprathermal electrons suggest that the trailing part of the MC has a different large‐scale magnetic topology, as expected. The azimuthal magnetic flux erosion estimated at ACE and STEREO A corresponds respectively to 44% and 49% of the inferred initial azimuthal magnetic flux before MC erosion upon propagation. The corresponding average reconnection rate during transit is estimated to be in the range 0.12–0.22 mV/m, suggesting most of the erosion occurs in the inner parts of the heliosphere. Future studies ought to quantify the influence of such an erosion process on geo‐effectiveness. Key Points Demonstrate the occurrence of magnetic cloud erosion during propagation Investigate all expected signatures of this mechanism Highlight the implications in terms of impact in the Heliosphere and at Earth
  • Editor: Washington, DC: Blackwell Publishing Ltd
  • Idioma: Inglês
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