基于试验粒子模拟的电离层人工调制激发的极低频和甚低频波对磁层高能电子的散射效应

常珊珊; 倪彬彬; 赵正予; 汪枫; 李金星; 赵晶晶; 顾旭东; 周晨

doi:10.7498/aps.63.069401

摘要

电离层调制加热能够有效激发极低频和甚低频（ELF/VLF）波，其中向上传播进入磁层的ELF/VLF 波能够与高能电子发生共振相互作用，具有人工沉降高能电子、消除辐射带等潜在实际用途. 本文综合运用射线追踪和试验粒子方法模拟电离层人工激发的单频ELF/VLF波在电离层和磁层的传播，以及在外辐射带层与高能电子的共振相互作用过程，通过投掷角和能量散射系数评估人工ELF/VLF波对磁层高能电子的共振散射效应. 研究表明，电离层人工ELF/VLF波传播到磁层后呈现高倾斜性，传播所能跨域的空间范围主要取决于加热的纬度位置和调制频率. 在内辐射带，与～100 keV到几个MeV 高能电子发生一阶共振相互作用的为>10 kHz的VLF波段；在外辐射带，为几百Hz到1 kHz的ELF波段. 对于L=4.5的外辐射带，试验粒子模拟结果显示，单个粒子在人工ELF波作用下投掷角和能量（α，E）的改变具有随机性，而所有试验粒子平均化的Δα2 和 ΔE2 随时间呈现出近似线性的增大，说明波粒共振散射过程体现出整体性. 基于试验粒子模拟得到的共振散射系数表明，幅度为10 pT的人工ELF波可在外辐射带的磁赤道局地对1 MeV电子产生较强的投掷角散射效应，进而影响高能电子的损失、沉降等动力学过程. 当人工ELF/VLF波在传播过程中变得高度倾斜，不仅最基本的一阶共振十分重要，高阶共振散射也具有较大效应. 这些定量分析结果表明，通过电离层加热激发人工ELF/VLF哨声波来沉降、消除辐射带高能电子具有可行性.

关键词:

Abstract

Ionospheric modulation can artificially trigger ELF/VLF whistler waves, which can leak into the inner magnetosphere and contribute to resonant interactions with energetic electrons. Combining the ray tracing method and test particle simulations, we investigate the propagation of these artificially generated ELF/VLF waves through the high ionosphere into the inner magnetosphere, and evaluate the subsequent effects of resonant scattering energetic electrons near the heart of the outer radiation belt. The results show that the artificially triggered ELF/VLF waves become highly oblique in the magnetosphere and their spatial extent of L shell and magnetic latitude can be significantly controlled by the initial launch latitude. Corresponding to the principal first-order resonance, the energetic electrons from ～ 100 keV to 3 MeV can resonate with the artificial VLF waves with frequency above 10 kHz in the inner radiation belt, while in the outer radiation belt these hazardous electrons can resonate with ELF waves from ～100 Hz to 1 kHz. At L=4.5 as the focus in this study, the artificial ELF waves can resonate with 1 MeV electron at the harmonics N=-1, 1, 2. In contrast, the Landau resonance rarely occurs for these energetic electrons. The results of test particle simulations indicate that while wave-induced changes in pitch angle and kinetic energy of a single electron are stochastic, the change averaged over all test electrons increases monotonically within the resonance timescale, which implies that resonant scattering is an overall characteristic of energetic electrons under the influence of the artificial whistler waves. Computed resonant scattering rates based on the test particle simulations indicate that aritificial ELF/VLF waves with an observable in situ wave amplitude of ～ 10 pT can drive efficient local pitch angle scattering of energetic electrons at the magnetic equator, thereby contributing considerably to their precipitation loss and magnetospheric electron dynamics. When the waves become highly oblique during the propagation, besides the fundamental first order resonance, higher order resonances can also drive efficient electron scattering. The results support the feasibility of generating artificially ELF/VLF whistler waves for controlled removal of energetic electrons in the Earth radiation belts.

Keywords:

作者及机构信息

1.
武汉大学电子信息学院空间物理系, 武汉 430072;

2.
中国纺织大学电子与电气工程学院光电信息系, 武汉 430200;

3.
北京大学空间物理与应用技术研究所, 北京 100871

基金项目: 国家自然科学基金（批准号：41204120）和武汉大学研究生自主科研项目（批准号：2012212020201）资助的课题.

Authors and contacts

1.
Department of Space physics, School of Electronic Information, Wuhan University, Wuhan 430072, China;

2.
Department of Optoelectronic Information, School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan 430200, China;

3.
Institute of Space Physics and Applied Technology, Peking University, Beijing 100871, China

Funds: projection supported by the national Natural Science Foundation of China (Grant No. 41204120) and Graduate Independent Research Project of Wuhan University, China (Grant No. 2012212020201).

参考文献

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[22]	Wang P, Wang H Y, Ma Y Q, Li X Q, Lu H, Meng X C, Zhang J L, Wang H, Shi F, Xu Y B, Yu X X, Zhao X Y, Wu F 2010 Acta Phys. Sin. 60 039401 (in chinese) [王平, 王焕玉, 马宇蒨, 李新乔, 卢红, 孟祥承, 张吉龙, 王辉, 石峰, 徐岩冰, 于晓霞, 赵小芸, 吴峰 2010 物理学报 60 039401]
[23]	Bortnik J, Thorne R M 2010 J. Geophys. Res. 115 A07213
[24]	Tao X, Bortnik J 2010 Nonlin. Processes Geophys. 17 599
[25]	Tao X, Bortnik J, Albert J M, Liu K, Thorne R M 2011 Geophys. Res. Lett. 38 L06105
[26]	Walter F 1969 Ph. D. Dissertation (California: Stanford Electronics Laboratories)
[27]	Wang F, Zhao Z Y, Chang S S, Ni B B, Gu X D 2012 Acta Phys. Sin. 61 199401 (in Chinese) [汪枫, 赵正予, 常珊珊, 倪彬彬, 顾旭东 2012 物理学报 61 199401]
[28]	Inan U S, Bell T F 1977 J. Geophys. Res. 19 2819
[29]	Xu J S, Mo Q X 1989 Chin. J. Geophys. 32 256 (in Chinese) [徐继生, 莫起绪 1989 地球物理学报 32 256]
[30]	Chang S S, Zhao Z Y 2011 Chin. J. Geophys. 54 2458 (in Chinese) [常珊珊, 赵正予, 汪枫 2011 地球物理学报 54 2458]
[31]	Helliwell R A 1965 Whistler and Related Ionospheric Phenomena (California: Stanford University Press)
[32]	Shi R, Ni B B, Gu X D, Zhao Z Y, Zhou C 2012 Phys. Plasmas 19 072904
[33]	Tao X, Bortnik J, Albert M J, Richard T M 2012 J. Geophys. Res. 117 A10205

施引文献

[1]	Thorne R M 2010 Geophys. Res. Lett. 37 L22107
[2]	Abel B, Thorne R M 1998 J. Geophys. Res. 103 2385
[3]	Abel B, Thorne R M 1998 J. Geophys. Res. 103 2397
[4]	Xiao F L, He Z G, Zhang S, Su Z P, Chen L X 2011 Chin. Phys. Lett. 28 039401
[5]	Zhang S, Xiao F L 2010 Chin. Phys. Lett. 27 129401
[6]	Summers D, Ni B B, Meredith N P 2007 J. Geophys. Res. 112 A04207
[7]	Summers D, Ni B B, Horne R B, Thorn R M, Moldwin M B, Anderson R R 2008 J. Geophys. Res. 113 A04219
[8]	Qureshi M N S, Sehar S, Shah H A, Cao J B 2013 Chin. Phys. B 22 035201
[9]	Chen Y, Zhao D, Liu W X, Wang Y, Wan X S 2012 Chin. Phys. B 20 104103
[10]	Zahedian M, Maraghechi B, Rouhani M H 2012 Chin. Phys. B 21 034101
[11]	Jiang H, Yang X X, Lin M M, Shi Y R, Duan W S 2011 Chin. Phys. B 20 019401
[12]	Inan U S, Chang H C, Helliwell R A 1984 J. Geophys. Res. 89 2891
[13]	Lyons L R, Thorne R M, Kennel C F 1972 J. Geophys. Res. 77 3455
[14]	Inan U S, Bell T F, Bortnik J, Albert J M 2003 J. Geophys. Res. 108 1186
[15]	Albert J M 2001 J. Geophys. Res. 106 8477
[16]	Kulkarni P, Inan U S, Bell T F, Bortnik J 2010 J. Geophys. Res. 113 A07214
[17]	Bell T F, Inan U S, Platino M, Pickett J S, Kosseg P A, Kennedy E J 2004 Geophys. Res. Lett. 31 L06811
[18]	Platino M, Inan U S, Bell T F, Pickett J, Kennedy E J, Trotignon J G, Ranch J L, Canu P 2004 Ann. Geophys. 22 2643
[19]	Platino M, Inan U S, Bell T F, Parrot M, Kennedy E J 2006 Geophys. Res. Lett. 33 L16101
[20]	Piddyachiy D, Inan U S, Bell T F, Lehtinen N G, Parrot M 2008 J. Geophys. Res. 113 A10308
[21]	Gu X D, Zhao Z Y, Ni B B, Wang X, Deng F 2008 Acta Phys. Sin. 57 6673 (in Chinese) [顾旭东, 赵正予, 倪彬彬, 王翔, 邓锋 2008 物理学报 57 6673]
[22]	Wang P, Wang H Y, Ma Y Q, Li X Q, Lu H, Meng X C, Zhang J L, Wang H, Shi F, Xu Y B, Yu X X, Zhao X Y, Wu F 2010 Acta Phys. Sin. 60 039401 (in chinese) [王平, 王焕玉, 马宇蒨, 李新乔, 卢红, 孟祥承, 张吉龙, 王辉, 石峰, 徐岩冰, 于晓霞, 赵小芸, 吴峰 2010 物理学报 60 039401]
[23]	Bortnik J, Thorne R M 2010 J. Geophys. Res. 115 A07213
[24]	Tao X, Bortnik J 2010 Nonlin. Processes Geophys. 17 599
[25]	Tao X, Bortnik J, Albert J M, Liu K, Thorne R M 2011 Geophys. Res. Lett. 38 L06105
[26]	Walter F 1969 Ph. D. Dissertation (California: Stanford Electronics Laboratories)
[27]	Wang F, Zhao Z Y, Chang S S, Ni B B, Gu X D 2012 Acta Phys. Sin. 61 199401 (in Chinese) [汪枫, 赵正予, 常珊珊, 倪彬彬, 顾旭东 2012 物理学报 61 199401]
[28]	Inan U S, Bell T F 1977 J. Geophys. Res. 19 2819
[29]	Xu J S, Mo Q X 1989 Chin. J. Geophys. 32 256 (in Chinese) [徐继生, 莫起绪 1989 地球物理学报 32 256]
[30]	Chang S S, Zhao Z Y 2011 Chin. J. Geophys. 54 2458 (in Chinese) [常珊珊, 赵正予, 汪枫 2011 地球物理学报 54 2458]
[31]	Helliwell R A 1965 Whistler and Related Ionospheric Phenomena (California: Stanford University Press)
[32]	Shi R, Ni B B, Gu X D, Zhao Z Y, Zhou C 2012 Phys. Plasmas 19 072904
[33]	Tao X, Bortnik J, Albert M J, Richard T M 2012 J. Geophys. Res. 117 A10205

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