Hybrid Simulation of Proton Cyclotron Waves Upstream of Mars Generated by Pickup Ion Beam Distribution

Cheng, Kun1; Liu, Kaijun1; Mousavi, Ameneh1; Cowee, Misa2; Liu, Yuqi1; Wang, Yan1; Wang, Mengmeng3; Zheng, Xianming1; Zhou, Jingyi1

2023-06-16

10.1029/2023GL103180

GEOPHYSICAL RESEARCH LETTERS   Impact Factor & Quartile

0094-8276

1944-8007

Linear instability analysis as well as a corresponding two-dimensional hybrid simulation are performed to examine the excitation of the proton cyclotron waves observed upstream of Mars. The waves are believed to be excited by the pickup ions produced from the ionization of the Martian hydrogen exosphere. And previous statistical analysis of wave observations suggested that the waves are mostly related to pickup ion beam velocity distributions. While earlier linear instability analysis of pickup ion beam distributions has mainly been focused on the parallel unstable modes, our analysis reveals that the maximum growth rate occurs at very oblique propagation. The corresponding hybrid simulation confirms the linear analysis results and further demonstrates that the pickup ions are scattered toward an isotropic shell velocity distribution by the waves excited. Interestingly, the waves at oblique propagation gradually damp out and the system is eventually dominated by waves of quasi-parallel propagation.

SCI

English

NI Journal Papers

First ; Corresponding

Strategic Priority Research Program of Chinese Academy of Sciences[XDB 41000000] ; National Natural Science Foundation of China (NSFC)["41974168","42174203"] ; Guangdong Pearl River Talent Program[2019QN01G838] ; Shenzhen Science and Technology Program["JCYJ20190809153407516","JCYJ20210324104810027"]

Geology

Geosciences, Multidisciplinary

WOS:001001917400001

AMER GEOPHYSICAL UNION

GEOSCIENCES

Web of Science

1.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China
2.Los Alamos Natl Lab, Los Alamos, NM USA
3.Shandong Univ, Inst Space Sci, Sch Space Sci & Phys, Shandong Key Lab Opt Astron & Solar Terr Environm, Weihai, Peoples R China

Cheng, Kun,Liu, Kaijun,Mousavi, Ameneh,et al. Hybrid Simulation of Proton Cyclotron Waves Upstream of Mars Generated by Pickup Ion Beam Distribution[J]. GEOPHYSICAL RESEARCH LETTERS,2023,50(11).

Cheng, Kun.,Liu, Kaijun.,Mousavi, Ameneh.,Cowee, Misa.,Liu, Yuqi.,...&Zhou, Jingyi.(2023).Hybrid Simulation of Proton Cyclotron Waves Upstream of Mars Generated by Pickup Ion Beam Distribution.GEOPHYSICAL RESEARCH LETTERS,50(11).

Cheng, Kun,et al."Hybrid Simulation of Proton Cyclotron Waves Upstream of Mars Generated by Pickup Ion Beam Distribution".GEOPHYSICAL RESEARCH LETTERS 50.11(2023).