Large-scale inverted-V channels of upflowing oxygen ions pumped by Alfvén waves
Large-scale inverted-V channels of upflowing oxygen ions are frequently identified in data collected by Cluster, at all local times, near the open-closed field line boundary over Earth’s high-latitude ionosphere-occur with downward propagating MHD Alfvén waves which have cascaded into kinetic regime...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Science Press
2023-11-01
|
| Series: | Earth and Planetary Physics |
| Subjects: | |
| Online Access: | http://www.eppcgs.org/article/doi/10.26464/epp2023082?pageType=en |
| _version_ | 1797629666498969600 |
|---|---|
| author | Hui Zhang Jun Zhong SuiYan Fu ZuYin Pu Yong Wei Lun Xie LiBo Liu QiAn Chen |
| author_facet | Hui Zhang Jun Zhong SuiYan Fu ZuYin Pu Yong Wei Lun Xie LiBo Liu QiAn Chen |
| author_sort | Hui Zhang |
| collection | DOAJ |
| description | Large-scale inverted-V channels of upflowing oxygen ions are frequently identified in data collected by Cluster, at all local times, near the open-closed field line boundary over Earth’s high-latitude ionosphere-occur with downward propagating MHD Alfvén waves which have cascaded into kinetic regimes of plasma. The transverse acceleration of the oxygen ions in the center of these structures is interpreted as the integrated energization by these waves along the channels. Also observed within the channels are upward parallel electric fields, a key characteristic of kinetic Alfvén waves, which may contribute not only to lifting the ions but also to precipitating aurora electrons that might initiate ion upflow in the ionosphere below. Statistics on five-year observations of Cluster show that the channels typically form during geomagnetic perturbations, particularly when solar-wind dynamic pressure is high or highly fluctuated. Near the open-closed field line boundary, the stronger the wave power, the higher the upward oxygen flux and the higher the beam energy, indicating that these waves provide a simple but efficient way to drive oxygen upflows. |
| first_indexed | 2024-03-11T10:57:22Z |
| format | Article |
| id | doaj.art-7de995211c3449f791dcfabc60cc74f9 |
| institution | Directory Open Access Journal |
| issn | 2096-3955 |
| language | English |
| last_indexed | 2024-03-11T10:57:22Z |
| publishDate | 2023-11-01 |
| publisher | Science Press |
| record_format | Article |
| series | Earth and Planetary Physics |
| spelling | doaj.art-7de995211c3449f791dcfabc60cc74f92023-11-13T06:10:44ZengScience PressEarth and Planetary Physics2096-39552023-11-017664065410.26464/epp2023082RA421-zhanghui-FLarge-scale inverted-V channels of upflowing oxygen ions pumped by Alfvén wavesHui Zhang0Jun Zhong1SuiYan Fu2ZuYin Pu3Yong Wei4Lun Xie5LiBo Liu6QiAn Chen7Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaKey Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaSchool of Earth and Space Sciences, Peking University, Beijing 100871, ChinaSchool of Earth and Space Sciences, Peking University, Beijing 100871, ChinaKey Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaSchool of Earth and Space Sciences, Peking University, Beijing 100871, ChinaKey Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaSchool of Earth and Space Sciences, Peking University, Beijing 100871, ChinaLarge-scale inverted-V channels of upflowing oxygen ions are frequently identified in data collected by Cluster, at all local times, near the open-closed field line boundary over Earth’s high-latitude ionosphere-occur with downward propagating MHD Alfvén waves which have cascaded into kinetic regimes of plasma. The transverse acceleration of the oxygen ions in the center of these structures is interpreted as the integrated energization by these waves along the channels. Also observed within the channels are upward parallel electric fields, a key characteristic of kinetic Alfvén waves, which may contribute not only to lifting the ions but also to precipitating aurora electrons that might initiate ion upflow in the ionosphere below. Statistics on five-year observations of Cluster show that the channels typically form during geomagnetic perturbations, particularly when solar-wind dynamic pressure is high or highly fluctuated. Near the open-closed field line boundary, the stronger the wave power, the higher the upward oxygen flux and the higher the beam energy, indicating that these waves provide a simple but efficient way to drive oxygen upflows.http://www.eppcgs.org/article/doi/10.26464/epp2023082?pageType=enoxygen ionsdispersive alfvén wavesion outflowparallel electric field |
| spellingShingle | Hui Zhang Jun Zhong SuiYan Fu ZuYin Pu Yong Wei Lun Xie LiBo Liu QiAn Chen Large-scale inverted-V channels of upflowing oxygen ions pumped by Alfvén waves Earth and Planetary Physics oxygen ions dispersive alfvén waves ion outflow parallel electric field |
| title | Large-scale inverted-V channels of upflowing oxygen ions pumped by Alfvén waves |
| title_full | Large-scale inverted-V channels of upflowing oxygen ions pumped by Alfvén waves |
| title_fullStr | Large-scale inverted-V channels of upflowing oxygen ions pumped by Alfvén waves |
| title_full_unstemmed | Large-scale inverted-V channels of upflowing oxygen ions pumped by Alfvén waves |
| title_short | Large-scale inverted-V channels of upflowing oxygen ions pumped by Alfvén waves |
| title_sort | large scale inverted v channels of upflowing oxygen ions pumped by alfven waves |
| topic | oxygen ions dispersive alfvén waves ion outflow parallel electric field |
| url | http://www.eppcgs.org/article/doi/10.26464/epp2023082?pageType=en |
| work_keys_str_mv | AT huizhang largescaleinvertedvchannelsofupflowingoxygenionspumpedbyalfvenwaves AT junzhong largescaleinvertedvchannelsofupflowingoxygenionspumpedbyalfvenwaves AT suiyanfu largescaleinvertedvchannelsofupflowingoxygenionspumpedbyalfvenwaves AT zuyinpu largescaleinvertedvchannelsofupflowingoxygenionspumpedbyalfvenwaves AT yongwei largescaleinvertedvchannelsofupflowingoxygenionspumpedbyalfvenwaves AT lunxie largescaleinvertedvchannelsofupflowingoxygenionspumpedbyalfvenwaves AT liboliu largescaleinvertedvchannelsofupflowingoxygenionspumpedbyalfvenwaves AT qianchen largescaleinvertedvchannelsofupflowingoxygenionspumpedbyalfvenwaves |