Nonlinear triggering process of whistler-mode emissions in a homogeneous magnetic field

• Material Type: 記事
• Title: Nonlinear triggering process of whistler-mode emissions in a homogeneous magnetic field
• Author/Editor: Yuya Fujiwara; Takeshi Nogi; Yoshiharu Omura
• Publication, Distribution, etc.: 日本 : The Society of Geomagnetism and Earth, Planetary and Space Sciences
• Publication Date: 2022-06-18
• Publication Date (W3CDTF): 2022-06-18
• Periodical title: EPS : Earth, Planets and Space
• No. or year of volume/issue: 74(95)
• Volume: 74(95)
• ISSN (Periodical Title): 1880-5981
• ISSN-L (Periodical Title): 1343-8832
• Text Language Code: eng
• DOI: 10.1186/s40623-022-01646-x; https://doi.org/10.1186/s40623-022-01646-x
• Persistent ID (NDL): info:ndljp/pid/12685382; https://dl.ndl.go.jp/pid/12685382
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• Date Accepted (W3CDTF): 2023-03-07T16:17:01+09:00
• Date Captured (W3CDTF): 2023-03-07
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• Periodical Title (URI): https://earth-planets-space.springeropen.com/articles
• Periodical Title (Persistent ID (NDL)): info:ndljp/pid/12287068; https://dl.ndl.go.jp/pid/12287068
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• Summary, etc.: We perform an electromagnetic particle simulation of triggered emissions in a uniform magnetic field for understanding of nonlinear wave–particle interaction in the vicinity of the magnetic equator. A finite length of a whistler-mode triggering wave packet with a constant frequency is injected by oscillating an external current at the equator. We find that the first subpacket of triggered emissions is generated in the homogeneous magnetic field. By analyzing resonant currents and resonant electron dynamics in the simulation, we find that the formation of an electron hole in a velocity phase space results in resonant currents, and the currents cause wave amplification and frequency increase. We obtain the interaction time of counter-streaming resonant electrons in a triggering wave packet with a finite width. By changing the duration time of the triggering pulse, we evaluate the interaction time necessary for formation of an electron hole. We conduct 4 runs with different duration times of the triggering pulse, 980, 230, 105, 40 Ωe⁻¹, which correspond to cases with interaction times, 370%, 86%, 39%, and 15% of the nonlinear trapping period, respectively. We find generation of triggered emissions in the three cases of 370%, 86%, and 39%, which agrees with the conventional nonlinear model that the nonlinear transition time, which is necessary for formation of resonant currents, is about a quarter of the nonlinear trapping period.
• DOI: 10.1186/s40623-022-01646-x; https://doi.org/10.1186/s40623-022-01646-x
• Access Restrictions: インターネット公開
• Rights (production): © The Author(s) 2022; This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
• Related Material (URI): http://hdl.handle.net/2433/276979; http://id.ndl.go.jp/digimeta/12685382; https://dl.ndl.go.jp/pid/12685382; https://link.springer.com/content/pdf/10.1186/s40623-022-01646-x.pdf; https://link.springer.com/article/10.1186/s40623-022-01646-x/fulltext.html
• Is Referenced By: A novel high accuracy finite-difference time-domain method; https://cir.nii.ac.jp/crid/1360584339757761664; Advanced numerical techniques for time integration of relativistic equations of motion for charged particles; https://cir.nii.ac.jp/crid/1360865815491498496
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• Bibliographic ID (NDL): 12685382; http://id.ndl.go.jp/bib/12685382