Electromagnetic Landau Resonance: Nonlinear Dynamics and Harmonic Generation
Abstract In situ particle observations provide useful information for determining the significance of nonlinearity in wave‐particle interactions. Here, we examine an electromagnetic Landau resonance event observed by the Magnetospheric Multiscale mission near the dayside magnetopause along this line...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2024-10-01
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| Series: | Geophysical Research Letters |
| Online Access: | https://doi.org/10.1029/2024GL110386 |
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| _version_ | 1850195601646419968 |
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| author | Z.‐Y. Liu Q.‐G. Zong Y.‐F. Wang J.‐H. Li X.‐Z. Zhou S. Wang L. Li |
| author_facet | Z.‐Y. Liu Q.‐G. Zong Y.‐F. Wang J.‐H. Li X.‐Z. Zhou S. Wang L. Li |
| author_sort | Z.‐Y. Liu |
| collection | DOAJ |
| description | Abstract In situ particle observations provide useful information for determining the significance of nonlinearity in wave‐particle interactions. Here, we examine an electromagnetic Landau resonance event observed by the Magnetospheric Multiscale mission near the dayside magnetopause along this line of thought. During this event, protons with energy ∼748 eV and pitch angle ∼25° are observed to resonate with electromagnetic‐ion‐cyclotron waves. Detailed data analysis reveals the existence of a second harmonic signal in proton modulation. Using an observation‐based test particle simulation, this signal is explained as a low‐resolution manifestation of phase space rolled‐up structures, which themselves are not observable due to limited instrument resolution. The presence of these rolled‐up structures suggests that the waves induce significant displacement of the protons in phase space, consequently confirming the nonlinear nature of the observed interaction. Based on the observations, we further discuss the possibility of the nonlinear electromagnetic Landau resonance generating second harmonic waves. |
| format | Article |
| id | doaj-art-5e7601edaf4f4decbe6f67d85ddbee52 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-5e7601edaf4f4decbe6f67d85ddbee522025-08-20T02:13:43ZengWileyGeophysical Research Letters0094-82761944-80072024-10-015120n/an/a10.1029/2024GL110386Electromagnetic Landau Resonance: Nonlinear Dynamics and Harmonic GenerationZ.‐Y. Liu0Q.‐G. Zong1Y.‐F. Wang2J.‐H. Li3X.‐Z. Zhou4S. Wang5L. Li6Institute of Space Physics and Applied Technology Peking University Beijing ChinaInstitute of Space Physics and Applied Technology Peking University Beijing ChinaInstitute of Space Physics and Applied Technology Peking University Beijing ChinaInstitute of Space Physics and Applied Technology Peking University Beijing ChinaInstitute of Space Physics and Applied Technology Peking University Beijing ChinaInstitute of Space Physics and Applied Technology Peking University Beijing ChinaInstitute of Space Physics and Applied Technology Peking University Beijing ChinaAbstract In situ particle observations provide useful information for determining the significance of nonlinearity in wave‐particle interactions. Here, we examine an electromagnetic Landau resonance event observed by the Magnetospheric Multiscale mission near the dayside magnetopause along this line of thought. During this event, protons with energy ∼748 eV and pitch angle ∼25° are observed to resonate with electromagnetic‐ion‐cyclotron waves. Detailed data analysis reveals the existence of a second harmonic signal in proton modulation. Using an observation‐based test particle simulation, this signal is explained as a low‐resolution manifestation of phase space rolled‐up structures, which themselves are not observable due to limited instrument resolution. The presence of these rolled‐up structures suggests that the waves induce significant displacement of the protons in phase space, consequently confirming the nonlinear nature of the observed interaction. Based on the observations, we further discuss the possibility of the nonlinear electromagnetic Landau resonance generating second harmonic waves.https://doi.org/10.1029/2024GL110386 |
| spellingShingle | Z.‐Y. Liu Q.‐G. Zong Y.‐F. Wang J.‐H. Li X.‐Z. Zhou S. Wang L. Li Electromagnetic Landau Resonance: Nonlinear Dynamics and Harmonic Generation Geophysical Research Letters |
| title | Electromagnetic Landau Resonance: Nonlinear Dynamics and Harmonic Generation |
| title_full | Electromagnetic Landau Resonance: Nonlinear Dynamics and Harmonic Generation |
| title_fullStr | Electromagnetic Landau Resonance: Nonlinear Dynamics and Harmonic Generation |
| title_full_unstemmed | Electromagnetic Landau Resonance: Nonlinear Dynamics and Harmonic Generation |
| title_short | Electromagnetic Landau Resonance: Nonlinear Dynamics and Harmonic Generation |
| title_sort | electromagnetic landau resonance nonlinear dynamics and harmonic generation |
| url | https://doi.org/10.1029/2024GL110386 |
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