Magnetic reconnection in the near‐Mars magnetotail: MAVEN observations
Magnetic reconnection in the near‐Mars magnetotail: MAVEN observations
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DOI：
10.1002/2015gl065004
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发表时间：
2015-11
影响因子：
5.2
通讯作者：
Y. Harada;J. Halekas;J. Mcfadden;D. Mitchell;C. Mazelle;J. Connerney;J. Espley;D. Larson
中科院分区：
文献类型：
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作者：
Y. Harada;J. Halekas;J. Mcfadden;D. Mitchell;C. Mazelle;J. Connerney;J. Espley;D. Larson
我们报告火星大气和挥发性演化（MAVEN）的电子，离子和磁场的观测，提供了全面的演示磁重联签名在火星磁尾。在XMSO <$-1.3RM的近火星尾电流片中，观察到具有双面损耗锥的捕获电子，表明闭合磁场拓扑。在封闭场区域，MAVEN观察到霍尔磁场特征和H+、O+和O2+离子的火星向整体流动，这表明存在来自航天器尾部的X线。重联流出离子的速度分布函数呈现出沿电流片法线沿着分离的逆流离子束，并且它们在流出方向上的体速度与离子质量成反比。这些特性与以前的多物种动力学模拟定性一致。近火星磁尾为研究多离子重联提供了独特的环境。
We report Mars Atmosphere and Volatile EvolutioN (MAVEN) observations of electrons, ions, and magnetic fields which provide comprehensive demonstration of magnetic reconnection signatures in the Martian magnetotail. In the near‐Mars tail current sheet at XMSO∼−1.3RM, trapped electrons with two‐sided loss cones were observed, indicating the closed magnetic field topology. In the closed field region, MAVEN observed Hall magnetic field signatures and Marsward bulk flows of H+, O+, and O2+ ions, which suggest the presence of X lines tailward from the spacecraft. Velocity distribution functions of the reconnection outflow ions exhibit counterstreaming beams separated along the current sheet normal, and their bulk velocities in the outflow direction inversely depend on ion mass. These characteristics are in qualitative agreement with previous multispecies kinetic simulations. The near‐Mars magnetotail provides a unique environment for studying multi‐ion reconnection.