Energy transfer from MHD-scale slow-mode waves to kinetic-scale ion acoustic waves
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866915689378349056 |
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| author | Shi, Xiaofei An, Xin Angelopoulos, Vassilis |
| author_facet | Shi, Xiaofei An, Xin Angelopoulos, Vassilis |
| contents | Large-amplitude slow-mode waves are commonly observed near Earth's magnetopause. Recent observations show that these waves can occur simultaneously with kinetic-scale ion acoustic waves. The amplitude of the ion acoustic waves is enhanced near the magnetic field peaks of the slow-mode wave, suggesting that the slow-mode waves may drive the generation of ion acoustic waves. To test this hypothesis, we conduct a hybrid simulation using observation-based parameters. The simulation results demonstrate that large-amplitude slow-mode waves generate counter-streaming ion beams, which in turn excite ion acoustic waves and relax the ion beams. Our study reveals a clear energy transfer channel from MHD-scale slow-mode waves to kinetic-scale ion acoustic waves. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_19763 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Energy transfer from MHD-scale slow-mode waves to kinetic-scale ion acoustic waves Shi, Xiaofei An, Xin Angelopoulos, Vassilis Plasma Physics Large-amplitude slow-mode waves are commonly observed near Earth's magnetopause. Recent observations show that these waves can occur simultaneously with kinetic-scale ion acoustic waves. The amplitude of the ion acoustic waves is enhanced near the magnetic field peaks of the slow-mode wave, suggesting that the slow-mode waves may drive the generation of ion acoustic waves. To test this hypothesis, we conduct a hybrid simulation using observation-based parameters. The simulation results demonstrate that large-amplitude slow-mode waves generate counter-streaming ion beams, which in turn excite ion acoustic waves and relax the ion beams. Our study reveals a clear energy transfer channel from MHD-scale slow-mode waves to kinetic-scale ion acoustic waves. |
| title | Energy transfer from MHD-scale slow-mode waves to kinetic-scale ion acoustic waves |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2509.19763 |