Drift Orbit Bifurcations and Cross-Field Transport in the Outer Radiation Belt: Global MHD and Integrated Test- Particle Simulations

R. T. Desai; J. P. Eastwood; R. B. HorneH. J. AllisonO. AllansonC. E. J. WattJ. W. B. EggingtonS. A. GlauertN. P. MeredithM. O. ArcherF. A. StaplesL. MejnertsenJ. K. TongJ. P. Chittenden

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Drift Orbit Bifurcations and Cross-Field Transport in the Outer Radiation Belt: Global MHD and Integrated Test- Particle Simulations

机译：漂移轨道分岔和跨域传输外辐射带:全球磁流体动力和集成测试——粒子模拟

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Energetic particle fluxes in the outer magnetosphere present a significant challenge to modeling efforts as they can vary by orders of magnitude in response to solar wind driving conditions. In this study, we demonstrate the ability to propagate test particles through global magnetohydrodynamic (MHD) simulations to a high level of precision and use this to map the cross-field radial transport associated with relativistic electrons undergoing drift orbit bifurcations (DOBs). The simulations predict DOBs primarily occur within an Earth radius of the magnetopause loss cone and appear significantly different for southward and northward interplanetary magnetic field orientations. The changes to the second invariant are shown to manifest as a dropout in particle fluxes with pitch angles cloEse to 90° and indicate DOBs are a cause of butterfly pitch angle distributions within the night-time sector. The convective electric field, not included in previous DOB studies, is found to have a significant effect on the resultant long-term transport, and losses to the magnetopause and atmosphere are identified as a potential method for incorporating DOBs within Fokker-Planck transport models.

机译：高能粒子通量外磁气圈的重大挑战建模工作,因为他们可以通过订单的变化级响应太阳风开车条件。测试粒子通过传播的能力全球磁流体动力(磁流体动力)模拟高水平的精度和使用这个映射跨域径向运输有关相对论性电子发生漂移轨道分岔(捐赠)。主要发生在地球的半径磁层显著损失锥和出现不同的向南和向北行星际磁场方向。更改第二显示不变表现为粒子通量与辍学螺距角cloEse 90°和指示强加于人蝴蝶节距角分布的原因在夜间部门。电场,而不是包含在之前的强加于人研究中,发现有重大的影响结果长期运输和损失被确定为磁层和气氛一个潜在的方法将强加于人福克尔普朗克运输模型。

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《Journal of Geophysical Research, A. Space Physics: JGR》 |2021年第10期|e2021JA029802-1-e2021JA029802-14|共14页
作者
R. T. Desai; J. P. Eastwood; R. B. HorneH. J. AllisonO. AllansonC. E. J. WattJ. W. B. EggingtonS. A. GlauertN. P. MeredithM. O. ArcherF. A. StaplesL. MejnertsenJ. K. TongJ. P. Chittenden;
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作者单位

Department of Physics, Blackett Laboratory, Imperial College London, London, UK;

Department of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Surrey, UK;

British Antarctic Survey, Cambridge, UKGFZ German Research Centre for Geosciences, Potsdam, GermanyDepartment of Mathematics, University of Exeter, Penryn/Cornwall Campus, Penryn, UKDepartment of Mathematics, Physics and Electrical Engineering, Northumbria University, Newcastle Upon Tyne, UK;

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BIFURCATION; Drift; driftEarth radiusmagnetopauseParticle Fluxouter radiation beltrise levelangle of pitch;

机译：分岔;漂移;driftEarthradiusmagnetopauseParticle Fluxouter辐射beltrise levelangle音高;

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1. Global variance reduction method for global Monte Carlo particle transport simulations of CFETR [J] . Xing-Chen Nie, Jia Li, Song-Lin Liu, 核技术（英文版） . 2017,第008期

Drift Orbit Bifurcations and Cross-Field Transport in the Outer Radiation Belt: Global MHD and Integrated Test- Particle Simulations

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