Magnetohydrodynamic simulation of interaction between the solar-wind magnetosphere, and ionosphere

太阳风磁层与电离层相互作用的磁流体动力学模拟

• 批准号: 09440172
• 负责人: OGINO Tatsuki
• 金额: $ 7.17万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-09440172/
• 关键词: solar wind-magnetosphere interaction; magnetohydrodynamics; MHD simulation; magnetosphere ionosphere coupling; interplanetary magnetic field; Jovian magnetosphere; magnetic reconnection; parallel computation

We have constructed a 3-dimensional global magnetohydrodynamic (MHD) model to self-consistently treat the solar wind-magnetosphere-ionosphere interaction, and have studied the transfer processes. Configuration and dynamics of the earth's magnetosphere are strongly affected by variations of the solar wind and interplanetary magnetic field (IMF) for recent several hours. Directly driven process on the magnetosphere like a polar electric potential responds in about 10 minutes to their variations, on the other hand loading-unloading precess like onset of tail reconnection in the plasma sheet usually needs about 1 hour time delay from sudden southward turn of IMF.Therefore, it is necessary to know the present magnetospheric configuration as well as the present parameters of the solar wind and IMF in order to obtain future magnetospheric configuration.Magnetosphere and ionosphere coupling is one of important processes. In order to include the ionospheric feedback process to the global MHD si … More mulation of the solar wind-magnetosphere interaction, field aligned currents are traditionally mapped from the inner boundary of magnetosphere onto the ionosphere, electric potential is calculated in the polar ionosphere by including ionospheric conductivity, and then convective electric fields are reversely mapped to the inner magnetosphere. We have tried the opposite procedure in our global MHD simulation.A 3-dimensional global MHD simulation of the interaction between the solar wind and the earth's magnetosphere has been executed to study the event of November 17, 1996 and the space weather "electrojet challenge" event of March 19-20, 1999. As input for the simulation, one minute values of solar wind parameters from the WIND and ACE satellites were utilized, namely the x-component of the solar wind velocity, the solar wind density, the plasma pressure and the y-and z-components of the IMF in solar-magnetospheric coordinates. We presented cross sectional profiles of energy in the noon-midnight and equatorial planes, polar plots of ionospheric potential and configuration of magnetic field lines every 10 minutes to compare with the satellite and SuperDARN observations. Less

我们已经构建了一个3维的全局磁流体动力（MHD）模型，以自感来处理太阳能磁层层相互作用，并研究了转移过程。近几个小时内，地球磁层的构型和动力学受到太阳风和星际磁场（IMF）的变化的强烈影响。磁层上直接驱动的过程像极性电势响应在大约10分钟内对它们的变化产生的变化，另一方面，加载无负荷的进度，例如浆片中的尾巴重新连接的发作通常需要大约1小时的时间延迟IMF的突然向南转动。电离层耦合是重要过程之一。为了将电离层的反馈过程包括在全球MHD SI上…对太阳风磁层相互作用进行更多的融合，传统上，电场对齐的电流是从磁层的内部边界上映射到离子层上的，电势是在极性层中通过电离层的电圈电力率在极地层中计算出的电势，然后将电源置于rectective oferctive电场上。 We have tried the opposite procedure in our global MHD simulation.A 3-dimensional global MHD simulation of the interaction between The solar wind and the earth's magnetosphere has been executed to study the event of November 17, 1996 and the space weather "electrojet challenge" event of March 19-20, 1999. As input for the simulation, one minute values ​​of solar wind parameters from the WIND and ACE satelites were utilized, namely the太阳风速度的X组分，太阳风密度，等离子压力和IMF的Y-Z组件在太阳能层坐标中。我们在中午午夜和等边平面，电离层电位的极地图和磁场线的构型呈现横截面剖面，每10分钟与卫星和超档观测进行比较。较少的

项目成果

Bargatze,L.F.: "Solar wind magnetic field control of magnetospheric response delay and expansion phase onset timing"J.Geophys.Res. 104. 14,583-14,599 (1999)

Bargatze，L.F.：“磁层响应延迟和膨胀相开始定时的太阳风磁场控制”J.Geophys.Res。

Ogino,T.: "Global MHD Simulation Code for the Earth's Magnetosphere Using HPF/JA"HUG2000. 14-22 (2000)

Ogino,T.：“使用 HPF/JA 的地球磁层全球 MHD 模拟代码”HUG2000。

荻野竜樹: "VPP Fortran からHPFへ"名古屋大学大型計算機センターニュース. Vol.31,No.4. 372-405 (2000)

Tatsuki Ogino：“从 VPP Fortran 到 HPF”名古屋大学大型计算机中心新闻，第 31 卷，第 372-405 期（2000 年）。

Nishida, A.: "Convection in the Earth's Magnetotail" AGU Monograph, American Geophysical Union. (in press). (1998)

Nishida, A.：“地球磁尾中的对流”AGU 专着，美国地球物理联盟。

荻野竜樹: "太陽風と磁気圏相互作用の電磁流体力学的シミュレーション"プラズマ・核融合学会誌,CD-ROM特別企画(解説論文). Vol.75,No.5CD-ROM20-30. (1999)

荻野龙树：“太阳风与磁层相互作用的磁流体动力学模拟”，日本等离子体与核聚变学会期刊，CD-ROM特别项目（解释性论文）第75卷，第5期CD-ROM20-30。 (1999)