长时间稳定弱向南行星际磁场条件的全球MHD模拟

IF 0.6 Q4 ASTRONOMY & ASTROPHYSICS

Journal of Astronomy and Space Sciences Pub Date : 2020-06-01 DOI:10.5140/JASS.2020.37.2.77

K. Park, Dae‐Young Lee, Khan‐Hyuk Kim

{"title":"长时间稳定弱向南行星际磁场条件的全球MHD模拟","authors":"K. Park, Dae‐Young Lee, Khan‐Hyuk Kim","doi":"10.5140/JASS.2020.37.2.77","DOIUrl":null,"url":null,"abstract":"We performed high-resolution three-dimensional global magnetohydrodynamic (MHD)\n simulations to study the interaction between the Earth’s magnetosphere and a prolonged\n steady southward interplanetary magnetic field (IMF) (Bz = –2nT) and slow solar wind.\n The simulation results show that dayside magnetic reconnection continuously occurs at\n the subsolar region where the magnetosheath magnetic field is antiparallel to the\n geomagnetic field. The plasmoid developed on closed plasma sheet field lines. We found\n that the vortex was generated at the magnetic equator such as (X, Y) = (7.6, 8.9) RE due\n to the viscous-like interaction, which was strengthened by dayside reconnection. The\n magnetic field and plasma properties clearly showed quasiperiodic variations with a\n period of 8–10 min across the vortex. Additionally, double twin parallel vorticity in\n the polar region was clearly seen. The peak value of the cross-polar cap potential\n fluctuated between 17 and 20 kV during the tail reconnection.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.6000,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":"{\"title\":\"Global MHD Simulation of a Prolonged Steady Weak Southward Interplanetary Magnetic\\n Field Condition\",\"authors\":\"K. Park, Dae‐Young Lee, Khan‐Hyuk Kim\",\"doi\":\"10.5140/JASS.2020.37.2.77\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"We performed high-resolution three-dimensional global magnetohydrodynamic (MHD)\\n simulations to study the interaction between the Earth’s magnetosphere and a prolonged\\n steady southward interplanetary magnetic field (IMF) (Bz = –2nT) and slow solar wind.\\n The simulation results show that dayside magnetic reconnection continuously occurs at\\n the subsolar region where the magnetosheath magnetic field is antiparallel to the\\n geomagnetic field. The plasmoid developed on closed plasma sheet field lines. We found\\n that the vortex was generated at the magnetic equator such as (X, Y) = (7.6, 8.9) RE due\\n to the viscous-like interaction, which was strengthened by dayside reconnection. The\\n magnetic field and plasma properties clearly showed quasiperiodic variations with a\\n period of 8–10 min across the vortex. Additionally, double twin parallel vorticity in\\n the polar region was clearly seen. The peak value of the cross-polar cap potential\\n fluctuated between 17 and 20 kV during the tail reconnection.\",\"PeriodicalId\":44366,\"journal\":{\"name\":\"Journal of Astronomy and Space Sciences\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.6000,\"publicationDate\":\"2020-06-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"2\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Astronomy and Space Sciences\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.5140/JASS.2020.37.2.77\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"ASTRONOMY & ASTROPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Astronomy and Space Sciences","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.5140/JASS.2020.37.2.77","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}

引用次数: 2

摘要

利用高分辨率三维全球磁流体动力学(MHD)模拟研究了地球磁层与长时间稳定的南向行星际磁场(IMF) (Bz = -2nT)和慢速太阳风之间的相互作用。模拟结果表明，在磁鞘磁场与地磁场反平行的亚太阳区，日侧磁重联持续发生。等离子体在封闭的等离子体片场线上形成。我们发现涡旋是在(X, Y) = (7.6, 8.9) RE的磁赤道处产生的，这是由于粘状相互作用，而日侧重联则加强了这种相互作用。磁场和等离子体的性质明显地呈现出准周期变化，周期为8-10 min。此外，在极区可以清楚地看到双双平行涡度。尾重联过程中，交叉极帽电位峰值在17 ~ 20kv之间波动。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

查看原文本刊更多论文

Global MHD Simulation of a Prolonged Steady Weak Southward Interplanetary Magnetic Field Condition

We performed high-resolution three-dimensional global magnetohydrodynamic (MHD) simulations to study the interaction between the Earth’s magnetosphere and a prolonged steady southward interplanetary magnetic field (IMF) (Bz = –2nT) and slow solar wind. The simulation results show that dayside magnetic reconnection continuously occurs at the subsolar region where the magnetosheath magnetic field is antiparallel to the geomagnetic field. The plasmoid developed on closed plasma sheet field lines. We found that the vortex was generated at the magnetic equator such as (X, Y) = (7.6, 8.9) RE due to the viscous-like interaction, which was strengthened by dayside reconnection. The magnetic field and plasma properties clearly showed quasiperiodic variations with a period of 8–10 min across the vortex. Additionally, double twin parallel vorticity in the polar region was clearly seen. The peak value of the cross-polar cap potential fluctuated between 17 and 20 kV during the tail reconnection.

求助全文

通过发布文献求助，成功后即可免费获取论文全文。去求助

来源期刊

Journal of Astronomy and Space Sciences ASTRONOMY & ASTROPHYSICS-

CiteScore

1.30

自引率

20.00%

发文量

审稿时长

12 weeks

期刊介绍： JASS aims for the promotion of global awareness and understanding of space science and related applications. Unlike other journals that focus either on space science or on space technologies, it intends to bridge the two communities of space science and technologies, by providing opportunities to exchange ideas and viewpoints in a single journal. Topics suitable for publication in JASS include researches in the following fields: space astronomy, solar physics, magnetospheric and ionospheric physics, cosmic ray, space weather, and planetary sciences; space instrumentation, satellite dynamics, geodesy, spacecraft control, and spacecraft navigation. However, the topics covered by JASS are not restricted to those mentioned above as the journal also encourages submission of research results in all other branches related to space science and technologies. Even though JASS was established on the heritage and achievements of the Korean space science community, it is now open to the worldwide community, while maintaining a high standard as a leading international journal. Hence, it solicits papers from the international community with a vision of global collaboration in the fields of space science and technologies.