Comparison of self‐consistent simulations with observed magnetic field and ion plasma parameters in the ring current during the 10 August 2000 magnetic storm
Comparison of self‐consistent simulations with observed magnetic field and ion plasma parameters in the ring current during the 10 August 2000 magnetic storm
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自洽模拟与 2000 年 8 月 10 日磁暴期间环流中观测到的磁场和离子等离子体参数的比较
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
G. Le
中科院分区：
文献类型：
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作者：
Margaret W. Chen;C. Lemon;T. Guild;M. Schulz;J. Roeder;G. Le
[1]我们评估磁和电自洽环电流模拟是否可以同时解释2000年8月10日大风暴（最小Dst =-107 nT）期间内磁层中的原位磁场和离子通量测量。我们使用赖斯对流模型平衡（RCM-E）和驱动它与时间相关的磁场，电场和等离子体边界条件，由经验和同化模型的指导。利用地球同步轨道运行环境卫星（GOES）模拟和观测的磁场与美国洛斯阿拉莫斯国家实验室（LANL）卫星观测的质子微分通量谱进行了比较。同样，模拟和观测磁场和质子密度和温度沿着极地轨道（r = 1.8-9 RE）的事件进行了比较。模拟和观测的磁场分量在GEO和沿着Polar轨道上相当吻合。然而，由于亚暴偶极化的影响没有明确的模型，模拟未能再现所观察到的磁场中的电磁波波动。在1到150 keV的能量范围内，RCM-E很好地再现了LANL 1994-084离子微分通量谱中的离子分散特征，这些离子微分通量谱是在GEO和质子密度和温度下从极地质子通量测量计算的。因此，RCM-E模拟可以同时考虑到2000年8月10日风暴的现场磁场和离子通量测量。这表明，自洽模型可以产生真实的风暴时间内磁层的功能。
[1] We assess whether magnetically and electrically self-consistent ring current simulations can account simultaneously for in situ magnetic field and ion flux measurements in the inner magnetosphere during the large 10 August 2000 storm (min Dst = −107 nT). We use the Rice Convection Model–Equilibrium (RCM-E) and drive it with time-dependent magnetic field, electric field, and plasma boundary conditions that are guided by empirical and assimilative models. Comparisons of the simulated and observed magnetic field from Geostationary Operational Environmental Satellites (GOES) and observed proton differential flux spectra from Los Alamos National Laboratory (LANL) satellites are made at geosynchronous orbit (GEO). Similarly, simulated and observed magnetic field and proton density and temperature are compared along the orbit of Polar (r ∼ 1.8–9 RE) for the event. The simulated and observed magnetic field components agree reasonably well at GEO and along the orbit of Polar. However, since the effects of substorm dipolarizations are not explicitly modeled, the simulation fails to reproduce observed sawtooth fluctuations in the magnetic field. Over energies from 1 to 150 keV, the RCM-E reproduced well the ion dispersion features in the LANL 1994-084 ion differential flux spectra over energies at GEO and proton densities and temperatures calculated from Polar proton flux measurements. Thus, the RCM-E simulations can account simultaneously for in situ magnetic field and ion flux measurements for the 10 August 2000 storm. This demonstrates that a self-consistent model can produce realistic features of the storm time inner magnetosphere.