Saturation Characteristics of Multi‐Band EMIC Waves in the Inner Magnetosphere and Observational Evidence for the Second Saturation Process
Abstract The wave amplitude is vital for quantifying the impact of electromagnetic ion cyclotron (EMIC) waves on inner magnetospheric dynamics. Previous numerical studies mainly focused on the evolution of total wave energy/amplitude, whose maximum is usually modeled as a function of initial conditi...
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| Format: | Article |
| Language: | English |
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Wiley
2025-01-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL113596 |
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| author | Zuxiang Xue Zhigang Yuan Dan Deng Xiongdong Yu |
| author_facet | Zuxiang Xue Zhigang Yuan Dan Deng Xiongdong Yu |
| author_sort | Zuxiang Xue |
| collection | DOAJ |
| description | Abstract The wave amplitude is vital for quantifying the impact of electromagnetic ion cyclotron (EMIC) waves on inner magnetospheric dynamics. Previous numerical studies mainly focused on the evolution of total wave energy/amplitude, whose maximum is usually modeled as a function of initial conditions. Recent quasilinear theory analysis shows existence of a second saturation of multi‐band EMIC waves which exhibits a dip of the total amplitude, emphasizing the need for more precise band‐specific models. Through one‐dimensional hybrid simulations, we reproduce the second saturation phenomenon and separately model wave characteristics for H+‐ and He+‐bands waves, including the maximum amplitudes and the time to maximum as a function of the initial maximum growth rate. Moreover, new parameters for the anisotropy‐beta inverse correlation of hot protons are obtained at the second saturation stage. We further present an in situ observation that first demonstrates the existence of the second saturation. |
| format | Article |
| id | doaj-art-4b0ad2bc5b8f45b9b4214b5ebba67c3c |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-4b0ad2bc5b8f45b9b4214b5ebba67c3c2025-01-20T13:05:57ZengWileyGeophysical Research Letters0094-82761944-80072025-01-01521n/an/a10.1029/2024GL113596Saturation Characteristics of Multi‐Band EMIC Waves in the Inner Magnetosphere and Observational Evidence for the Second Saturation ProcessZuxiang Xue0Zhigang Yuan1Dan Deng2Xiongdong Yu3School of Earth and Space Science and Technology Wuhan University Wuhan ChinaSchool of Earth and Space Science and Technology Wuhan University Wuhan ChinaSchool of Earth and Space Science and Technology Wuhan University Wuhan ChinaSchool of Earth and Space Science and Technology Wuhan University Wuhan ChinaAbstract The wave amplitude is vital for quantifying the impact of electromagnetic ion cyclotron (EMIC) waves on inner magnetospheric dynamics. Previous numerical studies mainly focused on the evolution of total wave energy/amplitude, whose maximum is usually modeled as a function of initial conditions. Recent quasilinear theory analysis shows existence of a second saturation of multi‐band EMIC waves which exhibits a dip of the total amplitude, emphasizing the need for more precise band‐specific models. Through one‐dimensional hybrid simulations, we reproduce the second saturation phenomenon and separately model wave characteristics for H+‐ and He+‐bands waves, including the maximum amplitudes and the time to maximum as a function of the initial maximum growth rate. Moreover, new parameters for the anisotropy‐beta inverse correlation of hot protons are obtained at the second saturation stage. We further present an in situ observation that first demonstrates the existence of the second saturation.https://doi.org/10.1029/2024GL113596EMIC waveswave saturationhybrid simulationlinear theoryinner magnetosphere |
| spellingShingle | Zuxiang Xue Zhigang Yuan Dan Deng Xiongdong Yu Saturation Characteristics of Multi‐Band EMIC Waves in the Inner Magnetosphere and Observational Evidence for the Second Saturation Process Geophysical Research Letters EMIC waves wave saturation hybrid simulation linear theory inner magnetosphere |
| title | Saturation Characteristics of Multi‐Band EMIC Waves in the Inner Magnetosphere and Observational Evidence for the Second Saturation Process |
| title_full | Saturation Characteristics of Multi‐Band EMIC Waves in the Inner Magnetosphere and Observational Evidence for the Second Saturation Process |
| title_fullStr | Saturation Characteristics of Multi‐Band EMIC Waves in the Inner Magnetosphere and Observational Evidence for the Second Saturation Process |
| title_full_unstemmed | Saturation Characteristics of Multi‐Band EMIC Waves in the Inner Magnetosphere and Observational Evidence for the Second Saturation Process |
| title_short | Saturation Characteristics of Multi‐Band EMIC Waves in the Inner Magnetosphere and Observational Evidence for the Second Saturation Process |
| title_sort | saturation characteristics of multi band emic waves in the inner magnetosphere and observational evidence for the second saturation process |
| topic | EMIC waves wave saturation hybrid simulation linear theory inner magnetosphere |
| url | https://doi.org/10.1029/2024GL113596 |
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