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Institut de recherche en astrophysique et planétologie |  |
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Institut de recherche en astrophysique et planétologie | |
| HAL: hal-00330040, version 1 |
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| Annales Geophysicae 23, 8 (2005) 2915-2920 |
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| Cluster and Double Star observations of dipolarization |
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| R. Nakamura 1W. Baumjohann 1 |
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| (2005-11-08) |
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| We studied two types of dipolarization events with different IMF conditions when Cluster and Double Star (TC-1) were located in the same local time sector: 7 August 2004, 18:00-24:00 UT, during a disturbed southward/northward IMF interval, and 14 August 2004, 21:00-24:00 UT, when the IMF was stably northward. Cluster observed dipolarization as well as fast flows during both intervals, but this was not the case for TC-1. For both events the satellites crossed near the conjugate location of the MIRACLE stations. By using multi-point analysis techniques, the direction/speed of the propagation is determined using Cluster and is then compared with the disturbances at TC-1 to discuss its spatial/temporal scale. The propagation direction of the BZ disturbance at Cluster was mainly dawnward with a tailward component for 7 August and with a significant Earthward component for 14 August associated with fast flows. We suggest that the role of the midtail fast flows can be quite different in the dissipation process depending on the condition of the IMF and resultant configuration of the tail. |
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| 1: | Space Research Institute |
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Space Research Institute |
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| 2: | Space and Atmospheric Phys. Group |
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Blackett Lab. |
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| 3: | Inst. für Geophysik und Extraterrestrische Physik |
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Inst. für Geophysik und Extraterrestrische Physik |
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| 4: | Max-Planck Inst. für extraterrestrische Physik |
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Max-Planck Inst. für Extraterrestrische Physik |
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| 5: | 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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| 6: | Space Science Center |
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Science and Engineering Research Center |
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| 7: | Finnish Meteorological Institute |
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Finnish Meteorological Institute |
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| Subject | : | Sciences of the Universe/Ocean, Atmosphere Sciences of the Universe/Earth Sciences |
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| Attached file list to this document: | |||||
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| hal-00330040, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00330040 | |
| oai:hal.archives-ouvertes.fr:hal-00330040 | |
| From: Publication EGU | |
| Submitted on: Tuesday, 8 November 2005 08:00:00 | |
| Updated on: Tuesday, 14 October 2008 09:21:24 | |
