Laser-plasma simulations of artificial magnetosphere formed by giant coronal mass ejections
Laser-plasma simulations of artificial magnetosphere formed by giant coronal mass ejections
复制标题
巨型日冕物质抛射形成的人造磁层的激光等离子体模拟
DOI：
10.1007/s10509-009-0002-1
复制
发表时间：
2008
影响因子：
1.9
通讯作者：
P. Brady
中科院分区：
文献类型：
--
作者：
Y. Zakharov;A. Ponomarenko;K. V. Vchivkov;W. Horton;P. Brady
利用实验室模拟（LPP）和数值模拟（3D/PIC程序）研究了CME对磁层顶（MP）的强压缩，有效能量E0≥1034 ergs。在可能形成的人工磁层（AM，在CME等离子体绕地球流动的情况下）中，当磁层距Rmp达到（2-3）RE时，由于全球磁场变化（SC速率>50 nT/s）引起的非常高的旋度电场，可能在空间和地面网络中发生许多灾难性的现象。AM的实验室模型（Rmp为0.1-30 cm）形成高场，1D和3D磁障碍物周围，E0高达kJ的LPP-斑点和磁化离子溢出。在俄罗斯团队的KI-1设施中，使用一套B-dot磁探针研究了大型AM的形状和内部结构，而UT的小型AM实验的主要目标是探索可能的冲击产生和相关的电子加速。KI-1实验的初步结果表明，AM的RM大小和SC（E0）都可用修正的Chapman-Ferraro标度来描述，而整个SC分布（赤道面前“二分之一”）可用著名的地球磁层顶场的“镜像偶极子”模型来描述。
We employed the laboratory (Laser-Produced Plasmas, LPP) and numerical (3D/PIC-code) simulations to study the resulting state of very strong compression of magnetopause (MP) by CME with effective energy E0≥1034 ergs directed to the Earth. During probable formation of an Artificial Magnetosphere (AM, in a flow of CME’ plasma around the Earth) with the MP stand-off at Rmp up to (2–3)RE, many catastrophic phenomena could occur in a space and ground networks due to very high curl electric fields induced by world-wide magnetic field’s changes with a SC-rate >50 nT/s. The laboratory models of AM (with Rmp∼0.1–30 cm) were formed around high-field, 1D and 3D magnetic obstacles, overflowing by LPP-blobs with E0 up to kJ and magnetized ions. The shape and internal structure of a large-scale AM were studied at KI-1 facility of the Russian team using a set of B-dot magnetic probes, while the main goal of UT’s small-AM experiment was to explore a possible shock’s generation and relevant electron acceleration. Preliminary results of KI-1 experiments show that the both Rm-size and SC (E0) of AM could be described by modified Chapman-Ferraro Scaling, while the whole SC-distribution (in front “one-half” of equatorial plane)—by well-known “Image Dipole” model of the Earth’s magnetopause field.