Propagation of strong electromagnetic waves in tenuous plasmas
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866912017332305920 |
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| author | Sobacchi, Emanuele Iwamoto, Masanori Sironi, Lorenzo Piran, Tsvi |
| author_facet | Sobacchi, Emanuele Iwamoto, Masanori Sironi, Lorenzo Piran, Tsvi |
| contents | We study the propagation of electromagnetic waves in tenuous plasmas, where the wave frequency, $ω_0$, is much larger than the plasma frequency, $ω_{\rm P}$. We show that in pair plasmas nonlinear effects are weak for $a_0 \ll ω_0/ω_{\rm P}$, where $a_0$ is the wave strength parameter. In electron-proton plasmas a more restrictive condition must be satisfied, namely either $a_0\ll 1/ω_{\rm P}τ_0$, where $τ_0$ is the duration of the radiation pulse, or $a_0\ll 1$. We derive the equations that govern the evolution of the pulse in the weakly nonlinear regime. Our results have important implications for the modeling of fast radio bursts. We argue that: (i) Millisecond duration bursts with a smooth profile must be produced in a proton-free environment, where nonlinear effects are weaker. (ii) Propagation through an electron-proton plasma near the source can imprint a sub-microsecond variability on the burst profile. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_04127 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Propagation of strong electromagnetic waves in tenuous plasmas Sobacchi, Emanuele Iwamoto, Masanori Sironi, Lorenzo Piran, Tsvi High Energy Astrophysical Phenomena Plasma Physics We study the propagation of electromagnetic waves in tenuous plasmas, where the wave frequency, $ω_0$, is much larger than the plasma frequency, $ω_{\rm P}$. We show that in pair plasmas nonlinear effects are weak for $a_0 \ll ω_0/ω_{\rm P}$, where $a_0$ is the wave strength parameter. In electron-proton plasmas a more restrictive condition must be satisfied, namely either $a_0\ll 1/ω_{\rm P}τ_0$, where $τ_0$ is the duration of the radiation pulse, or $a_0\ll 1$. We derive the equations that govern the evolution of the pulse in the weakly nonlinear regime. Our results have important implications for the modeling of fast radio bursts. We argue that: (i) Millisecond duration bursts with a smooth profile must be produced in a proton-free environment, where nonlinear effects are weaker. (ii) Propagation through an electron-proton plasma near the source can imprint a sub-microsecond variability on the burst profile. |
| title | Propagation of strong electromagnetic waves in tenuous plasmas |
| topic | High Energy Astrophysical Phenomena Plasma Physics |
| url | https://arxiv.org/abs/2409.04127 |