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首页> 外文会议>Cluster and double star symposium >FIELD-ALIGNED AND GYRATING ION BEAMS IN THE EARTH'S FORESHOCK
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FIELD-ALIGNED AND GYRATING ION BEAMS IN THE EARTH'S FORESHOCK

机译：地球前震中的磁场校准和旋转离子束

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The foreshock region is the first signature of therninteraction of the solar wind with a planet's plasmarnenvironment when approaching its collisionless bowrnshock. Part of its structure and dynamic is determinedrnby instabilities, which are created by the interaction ofrnthe solar wind with backstreaming ion populations.rnLarge amplitude quasi-monochromatic low-frequencyrnwaves are often observed in the Earth's foreshock.rnAssociated backstreaming ion distributions often revealrnthe existence of gyrating ions with well-defined pitchanglernand gyrophase organization around the localrnmagnetic field. Field-aligned ion beams observed in thernregion close to the gyrating ions region are shown to berngood candidate to generate the waves via the resonantrnion/ion right-hand mode instability. The cyclotronrnresonance is quantitatively demonstrated for the firstrntime from multi-spacecraft analysis by Cluster.rnDifferent mechanisms have been put forward to explainrnthe existence of the gyrophase-bunched ions. Thernpossibility of local nonlinear wave-particle interactionrninvolving initially field-aligned beam ions isrnquantitatively shown by the good agreement betweenrnobserved pitch-angles and those predicted fromrnanalytical test particle calculations.
机译：接近无碰撞的弓形冲击波时，前震区域是太阳风与行星的等离子体环境相互作用的第一个标志。它的部分结构和动力学是由不稳定性决定的，不稳定性是由太阳风与逆流离子种群的相互作用造成的。rn在地球前震中经常观察到大幅度的准单色低频波。在局部磁场周围具有清晰的螺距角和旋相组织。在靠近旋转离子区域的区域中观察到的场取向离子束被证明是良好的候选者，它可以通过共振/离子右手模式不稳定性产生波。团簇的多航天器分析首次定量证明了回旋共振。提出了不同的机理来解释旋回结合离子的存在。观察到的俯仰角与通过分析测试粒子计算预测得到的良好的一致性定量地表明了涉及初始场对准的束离子的局部非线性波-粒子相互作用的可能性。

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  • 来源
  • 会议地点 Noordwijk(NL);Noordwijk(NL)
  • 作者

    C. Mazelle; K. Meziane; M. Wilber;

  • 作者单位

    Centre d'Etudes Spatiales des Rayonnements, CNRS, 9 Avenue du Colonel Roche, Toulouse, 31400, France (Email:rnchristian.mazelle@cesr.fr);

    Physics Department, University of New Brunswick, Fredericton, NB, Canada;

    Space Sciences Laboratory, University of California, Berkeley, USA;

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