Characteristics of Low-Harmonic Magnetosonic Waves in the Earth's Inner Magnetosphere

被引：6
作者：
Teng, S. [1 ,2 ,3 ]
Liu, N. [1 ,2 ,3 ]
Ma, Q. [4 ,5 ]
Tao, X. [1 ,2 ,3 ]
机构：
[1] Univ Sci & Technol China, CAS Key Lab Geospace Environm, Dept Geophys & Planetary Sci, Hefei, Peoples R China
[2] CAS Ctr Excellence Comparat Planetol, Hefei, Peoples R China
[3] Univ Sci & Technol China, Mengcheng Natl Geophys Observ, Hefei, Peoples R China
[4] Boston Univ, Ctr Space Phys, Boston, MA 02215 USA
[5] Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USA
来源：
GEOPHYSICAL RESEARCH LETTERS | 2021年 / 48卷 / 08期
基金：
中国博士后科学基金; 中国国家自然科学基金;
关键词：
low-frequency magnetosonic wave; magnetosonic wave spectra; wave generation; RADIATION BELT ELECTRONS; RESONANT SCATTERING; DIFFUSION; NOISE; INSTABILITIES; DISTRIBUTIONS; EXCITATION;
D O I：
10.1029/2021GL093119
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Magnetosonic (MS) waves are electromagnetic waves that play important roles in the acceleration and scattering of radiation belt electrons. However, previous statistical analyses of the global MS wave distribution were mainly restricted to magnetic field measurements. In this study, we first report a low-harmonic MS wave event observed only by the electric field instrument in Van Allen Probes. The MS wave frequencies follow the local proton gyrofrequency (f(cp)), which suggests the characteristics of nearly local generation. We further statistically investigate similar wave events using Van Allen Probes data. The identified MS wave power exhibits peaks between 4f(cp) and 10f(cp), regardless of the L-shell, but it shows a dependence on magnetic local time. This work is supplemental to previous MS wave frequency spectra and provides new insights to better understand the source region of MS waves in the Earth's magnetosphere.
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页数：9
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