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Institut de recherche en astrophysique et planétologie |  |
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Institut de recherche en astrophysique et planétologie | |
| HAL : insu-00360347, version 1 |
| DOI : 10.1029/2007JA012771 |
| Fiche détaillée |  Récupérer au format |
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| Journal of Geophysical Research A: Space Physics 113, A7 (2008) A07S13 |
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| Effect of a northward turning of the interplanetary magnetic field on cusp precipitation as observed by Cluster |
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| P. Escoubet 1J. Berchem 2 |
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| (2008) |
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| The immediate effect of the rotation of the interplanetary magnetic field (IMF) from southward to northward on cusp precipitation has been rarely observed by a polar orbiting satellite in the past. The four Cluster spacecraft observed such an event on 23 September 2004 as they were crossing the polar cusp within 2–16 min from each other. Between the first three and the last spacecraft crossing the cusp, the IMF rotated from southward to northward with a dominant By (GSM) component. For the first time we can examine the changes in the particle precipitation immediately after such IMF change. The first two spacecraft observed typical IMF-southward ion dispersion, while the last one observed both an IMF-southward-like dispersion in the boundary layer and an IMF-northward dispersion in the cusp. After the IMF turning, the cusp is shown to have grown in size in both the poleward and equatorward directions. A three-dimensional magnetohydrodynamic simulation is used to determine the locations of the sources of the ions and the topology of the magnetic field during the event. |
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| 1 : | ESA European Space Agency, ESTEC |
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ESA ESTEC |
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| 2 : | Institute of Geophysics and Planetary Physics [Los Angeles] (IGPP) |
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University of California at Los Angeles |
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| 3 : | Centre d'étude spatiale des rayonnements (CESR) |
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CNRS : UMR5187 – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III |
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| 4 : | Lockheed Martin ATC |
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Lockheed Martin ATC |
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| 5 : | Laboratoire de Planétologie de Grenoble (LPG) |
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CNRS : UMR5109 – OSUG – INSU – Université Joseph Fourier - Grenoble I |
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| 6 : | Space Science and Technology Department (Ral Space) |
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STFC Rutherford Appleton Laboratory |
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| 7 : | Mullard Space science laboratory |
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University College of London (UCL) |
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| 8 : | Max Planck Institute for Solar System Research |
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Max Planck Institute for Solar System Research |
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| GROUND-BASED OBSERVATIONS – LOW-ALTITUDE OBSERVATIONS – POLAR CUSP – MAGNETOSHEATH PLASMA – LATITUDE – IMF – MAGNETOSPHERE – RECONNECTION – CONVECTION – MAGNETOPAUSE |
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| insu-00360347, version 1 | |
| http://hal-insu.archives-ouvertes.fr/insu-00360347 | |
| oai:hal-insu.archives-ouvertes.fr:insu-00360347 | |
| Contributeur : Béatrice Pibaret-Bourdon | |
| Soumis le : Mercredi 11 Février 2009, 08:59:48 | |
| Dernière modification le : Mercredi 11 Février 2009, 08:59:48 | |
