Citation:
Jiang Yu, Jing Wang, Jun Cui,
2019: Ring current proton scattering by low-frequency magnetosonic waves, Earth and Planetary Physics, 3, 365-372.
doi: 10.26464/epp2019037
2019, 3(4): 365-372. doi: 10.26464/epp2019037
Ring current proton scattering by low-frequency magnetosonic waves
| 1. | Space Science Institute, Macau University of Science and Technology, Macau, China |
| 2. | School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai Guangdong 519082, China |
| 3. | Key Laboratory of Lunar and Deep Space Exploration, Chinese Academy of Sciences, Beijing 100012, China |
Magnetosonic (MS) waves are believed to have the ability to affect the dynamics of ring current protons both inside and outside the plasmasphere. However, previous studies have focused primarily on the effect of high-frequency MS waves (f > 20 Hz) on ring current protons. In this study, we investigate interactions between ring current protons and low-frequency MS waves (< 20 Hz) inside the plasmasphere. We find that low-frequency MS waves can effectively accelerate < 20 keV ring current protons on time scales from several hours to a day, and their scattering efficiency is comparable to that due to high-frequency MS waves (>20 Hz), from which we infer that omitting the effect of low-frequency MS waves will considerably underestimate proton depletion at middle pitch angles and proton enhancement at large pitch angles. Therefore, ring current proton modeling should take into account the effects of both low- and high-frequency MS waves.
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