高速太阳风条件下日侧磁层顶磁通量传输事件的全球磁流体力学模拟结果

陈琛; 黄朝晖; 孙天然; 唐斌斌; 王赤

doi:10.11728/cjss2019.02.149

高速太阳风条件下日侧磁层顶磁通量传输事件的全球磁流体力学模拟结果

doi: 10.11728/cjss2019.02.149

陈琛^1,2,
黄朝晖¹,
孙天然¹,
唐斌斌¹,
王赤^1,2

1. 中国科学院国家空间科学中心空间天气学国家重点实验室北京 100190;
2. 中国科学院大学北京 100049

基金项目:

国家自然科学基金项目（41374172，41574159，41731070，41774173）；中国科学院空间科学战略性先导科技专项（XDA15052500）；中国科学院前沿重点项目（QYZDJ-SSW-JSC028）；中国科协青年人才托举工程项目（2017QNRC001）和中国科学院青年创新促进会项目（2016134）共同资助

详细信息

作者简介:
陈琛,E-mail:cchen@swl.ac.cn

中图分类号: P353
计量
- 文章访问数: 1408
- HTML全文浏览量: 101
- PDF下载量: 443
- 被引次数: 0
出版历程
- 收稿日期: 2018-04-10
- 修回日期: 2018-07-08
- 刊出日期: 2019-03-15

Global MHD Results of Flux Transfer Events at the Dayside Magnetopause under High Solar Wind Speed

1. State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190;
2. University of Chinese Academy of Sciences, Beijing 100049

摘要

摘要: 利用全球磁流体力学模拟，研究了高速太阳风条件下日侧磁层顶的磁通量传输事件（FTE）发生率的空间分布.从模拟结果中得到了FTE信号，并且这些FTE信号的特征与观测结果基本一致.磁层顶上的10个取样点共观测到39个FTE信号.统计分析表明，越靠近翼侧则观测到的FTE信号越少.这一现象可能是磁鞘中太阳风速度分布差异导致的.
- 磁通量传输事件 /
- 高速太阳风 /
- MHD模拟
Abstract: Using Global MHD model, the spatial distribution of Flux Transfer Events (FTE) at the dayside magnetopause under high solar wind speed is investigated. The solar wind conditions of this case are v_sw=1200 km·s^-1, n_sw=3 cm^-3, B_z=-8.3 nT, B_y=8.3 nT and B_x=0 nT. The simulation results virtually agree with those expected FTE signatures from observations, and bipolar signatures and related variations of number density, pressure and velocity are found. A total number of 39 FTE are observed by ten virtual probes which are spread over the magnetopause from y=-5R_e to y=5R_e. 14 FTE are found when the probe is near to the noon. However, when the probe is located near y=-5R_e and y=5R_e, the same number, 3, of FTE in both locations is found. Furthermore, 8 FTE are found when the probe is adjacent to y=-2.5R_e and 11 FTE are found near y=2.5R_e. In a nutshell, the number of FTE decreases as the observed probes approach the flank of the magnetopause, which could be caused by the distribution of solar wind velocity in magnetosheath.
- Flux transfer events /
- High solar wind speed /
- MHD simulation

HTML全文

参考文献(19)

[1]	RUSSELL C T, ELPHIC R C. Initial ISEE magnetometer results:magnetopause observations[J]. Space Sci. Rev., 1978, 22(5):681-715
[2]	RUSSELL C T, ELPHIC R C. ISEE observations of flux transfer events at the dayside magnetopause[J]. Geophys. Res. Lett, 1979, 6(1):33-36
[3]	RIJNBEEK R P, COWLEY S W H, SOUTHWOOD D J, et al. A survey of dayside flux transfer events observed by ISEE 1 and 2 magnetometers[J]. J. Geophys. Res.:Space Physics, 1984, 89(A2):786-800
[4]	PASCHMANN G, HAERENDEL G, PAPAMASTORAKIS I, et al. Plasma and magnetic field characteristics of magnetic flux transfer events[J]. J. Geophys. Res.:Space Phys., 1982, 87(A4):2159-2168
[5]	SONNERUP B U O. On the stress balance in flux transfer events[J]. J. Geophys. Res.:Space Phys., 1987, 92(A8):8613-8620
[6]	LEE L C, FU Z F. A theory of magnetic flux transfer at the Earth's magnetopause[J]. Geophys. Res. Lett., 1985, 12(2):105-108
[7]	DORELLI J C, BHATTACHARJEE A. On the generation and topology of flux transfer events[J]. J. Geophys. Res.:Space Phys., 2009, 114(A6):A06213. DOI:org/10. 1029/2008JA013410
[8]	KUO H, RUSSELL C T, LE G. Statistical studies of flux transfer events[J]. J. Geophys. Res.:Space Phys., 1995, 100(A3):3513-3519
[9]	WANG Y L, ELPHIC R C, LAVRAUD B, et al. Dependence of flux transfer events on solar wind conditions from 3 years of Cluster observations[J]. J. Geophys. Res., 2006, 111(A4):A04224. DOI: org/10.1029/2005JA011342
[10]	MILAN S E, IMBER S M, CARTER J A, et al. What controls the local time extent of flux transfer events[J]. J. Geophys. Res.:Space Phys., 2016, 121(2):1391-1401
[11]	RUSSELL C T, LE G, KUO H. The occurrence rate of flux transfer events[J]. Adv. Space Res., 1996, 18(8):197-205
[12]	SCURRY L, RUSSELL C T. Proxy studies of energy transfer to the magnetosphere[J]. J. Geophys. Res.:Space Phys., 1991, 96(A6):9541-9548
[13]	RAEDER J. Flux transfer events:1. Generation mechanism for strong southward IMF[J]. Ann. Geophys., 2006, 24:381-392
[14]	FEDDER J A, SLINKER S P, LYON J G, et al. Flux transfer events in global numerical simulations of the magnetosphere[J]. J. Geophys. Res.:Space Phys., 2002, 107(A5):SMP 1-1-SMP 1-10
[15]	PU Z Y, RAEDER J, ZHONG J, et al. Magnetic topologies of an in vivo FTE observed by Double Star/TC-1 at Earth's magnetopause[J]. Geophys. Res. Lett., 2013, 40(14):3502-3506
[16]	HU Y Q, GUO X C, WANG C. On the ionospheric and reconnection potentials of the Earth:Results from global MHD simulations[J]. J. Geophys. Res.:Space Phys., 2007, 112(A7):A07215. DOI: org/10.1029/2006JA010342
[17]	HUANG Z H, WANG C, HU Y Q, et al. Parallel Implementation of 3D global MHD simulations for Earth's magnetosphere[J]. Comp. Math. Appl., 2008, 55(6):1094-1101
[18]	ELPHIC R C. Observations of flux transfer events:A review[J]. Phys. Magnetop., 1995, 90:225-233
[19]	LE G, RUSSELL C T, KUO H. Flux transfer events:spontaneous or driven[J]. Geophys. Res. Lett., 1993, 20(9):791-794