Pitch Angle Structures of Ring Current Ions Induced by Evolving Poloidal Ultra-Low FrequencyWaves

被引：25

作者：

Liu, Z-Y ^{[1
]}

Zong, Q-G ^{[1
]}

Zhou, X-Z ^{[1
]}

Zhu, Y-F ^{[1
]}

Gu, S-J ^{[1
]}

机构：

[1] Peking Univ, Inst Space Phys & Appl Technol, Beijing, Peoples R China

来源：

GEOPHYSICAL RESEARCH LETTERS | 2020年 / 47卷 / 04期

基金：

中国国家自然科学基金;

关键词：

CHARGED-PARTICLE BEHAVIOR; HYDROMAGNETIC-WAVES; ULF WAVES;

D O I：

10.1029/2020GL087203

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Ultra-low frequency (ULF) waves can effectively accelerate ring current ions through drift-bounce resonance. Conventional theories have been developed to understand this resonance since the dawn of the space age, which usually assume ULF waves are quasi-steady in time. However, ULF waves would experience growth and damping stages in the real magnetosphere, which requires an adjustment of the conventional theories. Here, we attempt to reveal how ions respond to evolving ULF waves. By analyzing an event observed by Van Allen Probe A and reproducing the observations via simulation, we find the phase shift of ion flux oscillation across resonant pitch angles varies with time, when wave growth and damping cannot be neglected. As a result, the inclination angle of stripes in pitch angle spectrogram varies with time, causing "fishbone-like" pitch angle structures. One should take into account such ion behaviors when considering the role of drift-bounce resonance in the real magnetosphere.

引用

页数：9

共 21 条

[1] Van Allen Probes observation of localized drift resonance between poloidal mode ultra-low frequency waves and 60 keV electrons [J].

Claudepierre, S. G. ;

Mann, I. R. ;

Takahashi, K. ;

Fennell, J. F. ;

Hudson, M. K. ;

Blake, J. B. ;

Roeder, J. L. ;

Clemmons, J. H. ;

Spence, H. E. ;

Reeves, G. D. ;

Baker, D. N. ;

Funsten, H. O. ;

Friedel, R. H. W. ;

Henderson, M. G. ;

Kletzing, C. A. ;

Kurth, W. S. ;

MacDowall, R. J. ;

Smith, C. W. ;

Wygant, J. R. .

GEOPHYSICAL RESEARCH LETTERS, 2013, 40 (17) :4491-4497

[2] Global-Scale ULF Waves Associated With SSC Accelerate Magnetospheric Ultrarelativistic Electrons [J].

Hao, Y. X. ;

Zong, Q-G ;

Zhou, X-Z ;

Rankin, R. ;

Chen, X. R. ;

Liu, Y. ;

Fu, S. Y. ;

Baker, D. N. ;

Spence, E. ;

Blake, B. ;

Reeves, G. D. ;

Claudepierre, S. G. .

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2019, 124 (03) :1525-1538

[3] Relativistic electron dynamics produced by azimuthally localized poloidalmode ULF waves: Boomerang-shaped pitch angle evolutions [J].

Hao, Y. X. ;

Zong, Q. -G. ;

Zhou, X. -Z. ;

Rankin, R. ;

Chen, X. R. ;

Liu, Y. ;

Fu, S. Y. ;

Spence, H. E. ;

Blake, J. B. ;

Reeves, G. D. .

GEOPHYSICAL RESEARCH LETTERS, 2017, 44 (15) :7618-7627

[4]

Jacobs J. A., 2012, Geomagnetic micropulsations, V1

[5] The Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) on RBSP [J].

Kletzing, C. A. ;

Kurth, W. S. ;

Acuna, M. ;

MacDowall, R. J. ;

Torbert, R. B. ;

Averkamp, T. ;

Bodet, D. ;

Bounds, S. R. ;

Chutter, M. ;

Connerney, J. ;

Crawford, D. ;

Dolan, J. S. ;

Dvorsky, R. ;

Hospodarsky, G. B. ;

Howard, J. ;

Jordanova, V. ;

Johnson, R. A. ;

Kirchner, D. L. ;

Mokrzycki, B. ;

Needell, G. ;

Odom, J. ;

Mark, D. ;

Pfaff, R., Jr. ;

Phillips, J. R. ;

Piker, C. W. ;

Remington, S. L. ;

Rowland, D. ;

Santolik, O. ;

Schnurr, R. ;

Sheppard, D. ;

Smith, C. W. ;

Thorne, R. M. ;

Tyler, J. .

SPACE SCIENCE REVIEWS, 2013, 179 (1-4) :127-181

[6] Charged particle behavior in localized ultralow frequency waves: Theory and observations [J].

Li, Li ;

Zhou, Xu-Zhi ;

Zong, Qiu-Gang ;

Rankin, Robert ;

Zou, Hong ;

Liu, Ying ;

Chen, Xing-Ran ;

Hao, Yi-Xin .

GEOPHYSICAL RESEARCH LETTERS, 2017, 44 (12) :5900-5908

[7] Discovery of the action of a geophysical synchrotron in the Earth's Van Allen radiation belts [J].

Mann, Ian R. ;

Lee, E. A. ;

Claudepierre, S. G. ;

Fennell, J. F. ;

Degeling, A. ;

Rae, I. J. ;

Baker, D. N. ;

Reeves, G. D. ;

Spence, H. E. ;

Ozeke, L. G. ;

Rankin, R. ;

Milling, D. K. ;

Kale, A. ;

Friedel, R. H. W. ;

Honary, F. .

NATURE COMMUNICATIONS, 2013, 4

[8]

Mitchell TD, 2013, COMMUT ENGAGE HIGHER, P263

[9] Interaction of ULF waves with different ion species: Pitch angle and phase space density implications [J].

Ren, Jie ;

Zong, Q. G. ;

Zhou, X. Z. ;

Rankin, R. ;

Wang, Y. F. .

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2016, 121 (10) :9459-9472

[10]

SOUTHWOOD DJ, 1983, SPACE SCI REV, V35, P301, DOI 10.1007/BF00169231

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