The foreshock region is the first signature of the interaction of the solar wind with a planet’s plasma environment when approaching its collisionless bow shock. Part of its structure and dynamic is determined by instabilities, which are created by the interaction of the solar wind with backstreaming ion populations. The interaction of the reflected ions with the solar wind drives ion/ion beam instabilities, which generate waves that are then convected towards the shock by the solar wind. Subsequently they may mediate the shock structure and its reflection properties. The most well‐know examples are the field aligned ion beams (FABs), produced by reflection processes in the quasi‐perpendicular and oblique regions of the shock. Other prominent examples are the gyrating ions with well‐defined pitch‐angle and gyrophase organization around the local magnetic field observed downstream of the FABs region. These gyrophase‐bunched ions are always associated with large amplitude quasi‐monochromatic right‐hand mode low‐frequency waves. Different mechanisms have been put forward to explain these ion features. This paper will discuss recent advances on this topic from multi‐spacecraft observations (Cluster) as well as theoretical considerations.
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1 August 2005
THE PHYSICS OF COLLISIONLESS SHOCKS: 4th Annual IGPP International Astrophysics Conference
26 February-3 March 2005
Palm Springs, California (USA)
Research Article|
August 01 2005
Field‐aligned and Gyrating Ion Beams in a Planetary Foreshock
C. Mazelle;
C. Mazelle
1Centre d’Etudes Spatiales des Rayonnements, CNRS, 9 Avenue du Colonel Roche, Toulouse, 31400, France
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K. Meziane;
K. Meziane
2Physics Department, University of New Brunswick, Fredericton, NB, Canada
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M. Wilber;
M. Wilber
3Space Sciences Laboratory, University of California, Berkeley
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D. Le Quéau
D. Le Quéau
4Observatoire Midi‐Pyrénées, Toulouse, France
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AIP Conf. Proc. 781, 89–94 (2005)
Citation
C. Mazelle, K. Meziane, M. Wilber, D. Le Quéau; Field‐aligned and Gyrating Ion Beams in a Planetary Foreshock. AIP Conf. Proc. 1 August 2005; 781 (1): 89–94. https://doi.org/10.1063/1.2032680
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