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首页> 外文期刊>Planetary and space science >Coronal mass ejection hits mercury: A.I.K.E.F. hybrid-code results compared to MESSENGER data
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Coronal mass ejection hits mercury: A.I.K.E.F. hybrid-code results compared to MESSENGER data

机译：日冕物质抛射击中汞：A.I.K.E.F.混合代码结果与MESSENGER数据比较

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摘要

Mercury is the closest orbiting planet around the sun and is therefore embedded in an intensive and highly varying solar wind. In-situ data from the MESSENGER spacecraft of the plasma environment near Mercury indicates that a coronal mass ejection (CME) passed the planet on 23 November 2011 over the span of the 12 h MESSENGER orbit. Slavin et al. (2014) derived the upstream parameters of the solar wind at the time of that orbit, and were able to explain the observed MESSENGER data in the cusp and magnetopause segments of MESSENGER's trajectory. These upstream parameters will be used for our first simulation run. We use the hybrid code A.I.K.E.F. which treats ions as individual particles and electrons as a mass-less fluid, to conduct hybrid simulations of Mercury's magnetospheric response to the impact of the CME on ion gyro time scales. Results from the simulation are in agreement with magnetic field measurements from the inner day-side magnetosphere and the bow-shock region. However, at the planet's nightside, Mercury's plasma environment seemed to be governed by different solar wind conditions, in conclusion, Mercury's interaction with the CME is not sufficiently describable by only one set of upstream parameters. Therefore, to simulate the magnetospheric response while MESSENGER was located in the tail region, we use parameters obtained from the MHD solar wind simulation code SUSANOO (Shiota et al. (2014)) for our second simulation run. The parameters of the SUSANOO model achieve a good agreement of the data concerning the plasma tall crossing and the night-side approach to Mercury. However, the polar and closest approach are hardly described by both upstream parameters, namely, neither upstream dataset is able to reproduce the MESSENGER crossing of Mercury's magnetospheric cusp. We conclude that the respective CME was too variable on the timescale of the MESSENGER orbit to be described by only two sets of upstream conditions. Our results suggest locally strong and highly variable dynamics of the CME on timescales of 15 min while MESSENGER was near closest approach.
机译：汞是围绕太阳运行的最接近的行星，因此被嵌入强烈且变化很大的太阳风中。来自水星附近的等离子环境的MESSENGER航天器的现场数据表明，日冕物质抛射（CME）于2011年11月23日在MESSENGER轨道12小时的范围内通过了该行星。 Slavin等。 （2014年）推导了该轨道运行时太阳风的上游参数，并能够解释在MESSENGER轨迹的尖端和磁绝经段中观测到的MESSENGER数据。这些上游参数将用于我们的第一次模拟运行。我们使用混合代码A.I.K.E.F.该软件将离子视为单独的粒子，将电子视为无质量的流体，以进行水银对CME对离子陀螺仪时标影响的磁层响应的混合模拟。模拟的结果与来自日内磁层和船首冲击区的磁场测量结果一致。但是，在地球的夜晚，水星的等离子体环境似乎受不同的太阳风条件控制，因此，总的来说，水银与CME的相互作用不能仅由一组上游参数来充分描述。因此，为了在MESSENGER位于尾部区域时模拟磁层响应，我们使用从MHD太阳风模拟代码SUSANOO（Shiota等人（2014））获得的参数进行第二次模拟运行。 SUSANOO模型的参数与等离子高空穿越和夜间水星方法有关的数据取得了很好的一致性。但是，极地方法和最接近方法很难用两个上游参数来描述，也就是说，两个上游数据集都无法再现水星磁层尖端的MESSENGER交点。我们得出的结论是，相应的CME在MESSENGER轨道的时间尺度上变化太大，仅由两组上游条件来描述。我们的结果表明，在MESSENGER接近最接近方法的情况下，CME在15分钟的时间尺度上具有强大且高度可变的动态。

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  • 来源
    《Planetary and space science》 |2018年第4期|89-99|共11页
  • 作者

    Exner W.; Heyner D.; Liuzzo L.; Motschmann U.; Shiota D.; Kusano K.; Shibayama T.;

  • 作者单位

    TU Braunschweig, Inst Theoret Phys, Braunschweig, Germany;

    TU Braunschweig, Inst Geophys & Extraterr Phys, Braunschweig, Germany;

    Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA;

    TU Braunschweig, Inst Theoret Phys, Braunschweig, Germany;

    Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan;

    Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan;

    Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Plasma interaction; Mercury; Hybrid; Simulation; CME;

    机译：等离子体相互作用;水银;杂化;模拟;CME;

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