1,- 1School of Earth and Space Science and Technology, Wuhan University, Wuhan, China (yunxiaotong@whu.edu.cn)
- 2Swedish Institute of Space Physics, Kiruna, Sweden
- 3Chinese Academy of Sciences Center for Excellence in Comparative Planetology, Hefei, China
- 4School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai, China
- 5CAS Engineering Laboratory for Deep Resources Equipment and Technology, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
- 6College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China
We perform an observational event from Mars Atmosphere and Volatile Evolution (MAVEN) instruments that magnetosonic waves and penetrating solar wind H+ are simultaneously observed in Martian magnetic pileup region, accompanied by large reflected H+ flux. Combined with the observations, we use test particle simulations to quantify wave-particle interactions between the waves and H+ and the resulting H+ reflection. The results show that there is a strong Landau resonance for 101–104 eV H+ on time scale of ~12 s, with pitch-angle scattering at <(Δα)2> = 10-2–10-1 rad2 and energy diffusion at <(ΔEk/Ek0)2> = ~10-2. Surprisingly, the non-resonance effect can also affect the H+ with lower energy 100–101 eV. Landau resonance makes the reflection efficiency of penetrating H+ reach 12.30% with high energy (103–104 eV) and large pitch-angle (45°–90°), which provides a new way for reflecting the penetrating H+ to space.
How to cite: Yun, X., Fu, S., Ni, B., Cui, J., and Ge, Y.: Reflection of Martian Penetrating Solar Wind Protons due to Wave-particle Interactions with Magnetosonic Waves, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-18700, https://doi.org/10.5194/egusphere-egu25-18700, 2025.
