Cluster observations of magnetic field fluctuations in the high-altitude cusp
| Autor: | Y. V. Bogdanova, André Balogh, Iannis Dandouras, Malcolm Dunlop, Benoit Lavraud, Peter J. Cargill, H. Rème, Timothy S. Horbury, Katariina Nykyri, Elizabeth Lucek, Andrew Fazakerley |
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| Přispěvatelé: | Blackett Laboratory, Imperial College London, Centre d'étude spatiale des rayonnements (CESR), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), STFC Rutherford Appleton Laboratory (RAL), Science and Technology Facilities Council (STFC), Mullard Space Science Laboratory (MSSL), University College of London [London] (UCL), Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Atmospheric Science
010504 meteorology & atmospheric sciences Cyclotron [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Magnetosphere 7. Clean energy 01 natural sciences law.invention Optics law 0103 physical sciences Earth and Planetary Sciences (miscellaneous) lcsh:Science 010303 astronomy & astrophysics 0105 earth and related environmental sciences [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Physics business.industry lcsh:QC801-809 Geology Astronomy and Astrophysics Space physics Plasma lcsh:QC1-999 Computational physics Magnetic field lcsh:Geophysics. Cosmic physics Solar wind Space and Planetary Science Physics::Space Physics Magnetopause lcsh:Q Vector field business lcsh:Physics |
| Zdroj: | Annales Geophysicae Annales Geophysicae, 2004, 22 (7), pp.2413-2429 Annales Geophysicae, Vol 22, Iss 7, Pp 2413-2429 (2004) Scopus-Elsevier Annales Geophysicae, European Geosciences Union, 2004, 22 (7), pp.2413-2429 Annales Geophysicae, Vol 22, Pp 2413-2429 (2004) |
| ISSN: | 1432-0576 0992-7689 |
| Popis: | High-resolution (22 vector/s) magnetic field data from Cluster FGM instrument are presented for the high-altitude cusp crossing on 17 March 2001. Despite the quiet solar wind conditions, the cusp was filled with magnetic field turbulence for much of the crossing. Large-scale fluctuations show some correlation between spacecraft but the higher frequency fluctuations show no correlation, indicating that the length scales of these waves are smaller than the spacecraft separation (500km). In many intervals, there are clear peaks in the wave power around the ion cyclotron frequency (~1Hz), and there is some evidence for waves at the first harmonic of this frequency. Both left- and right-hand polarised waves are found, with angles of propagation with respect to the ambient magnetic field that range from parallel to perpendicular. The regions of enhanced magnetic field fluctuations appear to be associated with plasma flows possibly originating from a lobe reconnection site. The most coherent, long lasting wave trains with frequencies close to local ion cyclotron frequency occur at a boundary between a sheared flow and a stagnant plasma. |
| Databáze: | OpenAIRE |
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