Simulating the Ring Current Proton Dynamics in Response to Radial Diffusion by Ultra‐Low‐Frequency (ULF) Waves
Abstract Radial diffusion (RD) induced by ULF waves can contribute to particle acceleration and scattering. Past global simulations that incorporate RD often use dipole magnetic fields, which could not realistically reveal the role of RD. To better understand the effects of RD and identify whether a...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2024-03-01
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| Series: | Geophysical Research Letters |
| Online Access: | https://doi.org/10.1029/2023GL107326 |
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| _version_ | 1850134901083340800 |
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| author | Longxing Ma Yiqun Yu Wenlong Liu Jinbin Cao Yoshizumi Miyoshi |
| author_facet | Longxing Ma Yiqun Yu Wenlong Liu Jinbin Cao Yoshizumi Miyoshi |
| author_sort | Longxing Ma |
| collection | DOAJ |
| description | Abstract Radial diffusion (RD) induced by ULF waves can contribute to particle acceleration and scattering. Past global simulations that incorporate RD often use dipole magnetic fields, which could not realistically reveal the role of RD. To better understand the effects of RD and identify whether a background magnetic field model matters in understanding the ring current dynamics in response to RD, we simulate a storm event with different magnetic configurations using a global kinetic ring current model. Results indicate that RD can effectively diffuse protons of hundreds of keV to inner regions (L ∼ 3.5), especially in recovery phase. Comparisons with in‐situ observations demonstrate that simulations with TS05 overall capture both the intensity and variations of proton fluxes with the aid of RD, whereas that with a dipole field significantly overestimates low‐L region fluxes. This study implies adopting realistic magnetic fields is important for correctly interpreting the role of RD. |
| format | Article |
| id | doaj-art-5aedff2284b64c39a227c4ccfc29236e |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2024-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-5aedff2284b64c39a227c4ccfc29236e2025-08-20T02:31:37ZengWileyGeophysical Research Letters0094-82761944-80072024-03-01516n/an/a10.1029/2023GL107326Simulating the Ring Current Proton Dynamics in Response to Radial Diffusion by Ultra‐Low‐Frequency (ULF) WavesLongxing Ma0Yiqun Yu1Wenlong Liu2Jinbin Cao3Yoshizumi Miyoshi4School of Space and Environment Beihang University Beijing ChinaSchool of Space and Environment Beihang University Beijing ChinaSchool of Space and Environment Beihang University Beijing ChinaSchool of Space and Environment Beihang University Beijing ChinaInstitute for Space‐Earth Environmental Research Nagoya University Nagoya JapanAbstract Radial diffusion (RD) induced by ULF waves can contribute to particle acceleration and scattering. Past global simulations that incorporate RD often use dipole magnetic fields, which could not realistically reveal the role of RD. To better understand the effects of RD and identify whether a background magnetic field model matters in understanding the ring current dynamics in response to RD, we simulate a storm event with different magnetic configurations using a global kinetic ring current model. Results indicate that RD can effectively diffuse protons of hundreds of keV to inner regions (L ∼ 3.5), especially in recovery phase. Comparisons with in‐situ observations demonstrate that simulations with TS05 overall capture both the intensity and variations of proton fluxes with the aid of RD, whereas that with a dipole field significantly overestimates low‐L region fluxes. This study implies adopting realistic magnetic fields is important for correctly interpreting the role of RD.https://doi.org/10.1029/2023GL107326 |
| spellingShingle | Longxing Ma Yiqun Yu Wenlong Liu Jinbin Cao Yoshizumi Miyoshi Simulating the Ring Current Proton Dynamics in Response to Radial Diffusion by Ultra‐Low‐Frequency (ULF) Waves Geophysical Research Letters |
| title | Simulating the Ring Current Proton Dynamics in Response to Radial Diffusion by Ultra‐Low‐Frequency (ULF) Waves |
| title_full | Simulating the Ring Current Proton Dynamics in Response to Radial Diffusion by Ultra‐Low‐Frequency (ULF) Waves |
| title_fullStr | Simulating the Ring Current Proton Dynamics in Response to Radial Diffusion by Ultra‐Low‐Frequency (ULF) Waves |
| title_full_unstemmed | Simulating the Ring Current Proton Dynamics in Response to Radial Diffusion by Ultra‐Low‐Frequency (ULF) Waves |
| title_short | Simulating the Ring Current Proton Dynamics in Response to Radial Diffusion by Ultra‐Low‐Frequency (ULF) Waves |
| title_sort | simulating the ring current proton dynamics in response to radial diffusion by ultra low frequency ulf waves |
| url | https://doi.org/10.1029/2023GL107326 |
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