Year: 2025
Type: article
Abstract: Hiss waves play a critical role in shaping Earth's radiation belts and mediating magnetosphere‐ionosphere energy transfer. Intense hiss emissions are frequently generated within dynamic plasmaspheric plumes through linear and nonlinear wave‐particle interactions. However, the contribution of plume hiss to the spatial distribution of hiss throughout the plasmasphere is not yet well quantified. In this study, we perform ray‐tracing simulations to investigate the global propagation of plume hiss under varying plume morphologies, including different widths and levels of density lumpiness. We find that most hiss power is confined near the local time sector of the plume. Narrower plumes with embedded density ducts significantly enhance earthward wave guidance into the plasmaspheric core, compared to wide, smooth plumes. Furthermore, a subset of rays guided azimuthally along the plasmapause can serve as seed waves for intense dayside hiss. Our results highlight the role of plume hiss in shaping the global‐scale distribution of hiss waves.
Source: Geophysical Research Letters
DOI: 10.1029/2025gl119873
Authors: Xiangling Ding, Zhiyong Wu, Zhaoguo He, Qi Yan, Xiangyu Chen, Jiang Yu, Yonghui Ma
Institutions: Sun Yat-sen University, University of Science and Technology of China, Macau University of Science and Technology, China National Space Administration, State Key Laboratory of Lunar and Planetary Sciences, Chinese Academy of Sciences, National Space Science Center, Harbin Institute of Technology
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,190
OpenAlex ID: W4417517768