Modulation of Ion Pitch Angle in the Presence of Large-amplitude, Electromagnetic Ion Cyclotron (EMIC) Waves: 1-D Hybrid Simulation
- 1National Space Science Center,CAS, State Key laboratory of Space Weather, China (sti@swl.ac.cn)
- 2Institute of Applied Physics and Computational Mathematics
Large-amplitude electromagnetic ion cyclotron (EMIC) waves induce unique dynamics of charged particle movement in the magnetosphere. In a recent study, modulation of the ion pitch angle in the presence of large-amplitude EMIC waves is observed, and there lacks a good explanation for this phenomenon. We investigate this modulation primarily via a 1-D hybrid simulation model and find that the modulation is caused by the bulk velocity triggered by large-amplitude EMIC waves. Affected by the bulk velocity, the number density of ions will enhance around pitch angle . Beyond that, the ion pitch angle is also modulated by the EMIC waves, and the modulation period is half of the EMIC waves' period. In addition, parameters that affect ion pitch angle modulation, including the wave amplitude, ion energy, ion species, and wave normal angle, are studied in our work.
How to cite: Ti, S., Chen, T., and Yao, J.: Modulation of Ion Pitch Angle in the Presence of Large-amplitude, Electromagnetic Ion Cyclotron (EMIC) Waves: 1-D Hybrid Simulation, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-5211, https://doi.org/10.5194/egusphere-egu21-5211, 2021.