Cross‐Scale Interactions Between ULF Waves, VLF Waves, and Electrons
Abstract Wave‐particle interactions are essential for energy transport in the magnetosphere. In this study, we investigated an event during which electrons interact simultaneously with waves in different scales, using data from the Magnetospheric Multiscale mission. At the macroscale ( km), drift resonance between ultra‐low frequency (ULF) waves and 70–300 keV electrons is observed. At the microscale ( km), lower‐band chorus waves and electron cyclotron harmonic (ECH) waves are alternately generated, showing signatures of modulation by ULF waves. We found that compressional ULF waves affect the temperature anisotropy of 1–10 keV electrons, thereby periodically exciting chorus waves. Through linear instability analysis, we propose that ULF waves modulate ECH wave emissions by regulating the gradient of electron phase space density at the edge of the loss cone. Our results enhance the understanding of cross‐scale wave‐particle interactions, highlighting their importance in magnetospheric dynamics.
Authors
- C. T. Russell (ORCID: https://orcid.org/0000-0003-1639-8298)
- Xingyu Li (ORCID: https://orcid.org/0000-0001-9310-4826)
- Peter Lindqvist (ORCID: https://orcid.org/0000-0001-5617-9765)
- Chao Yue (ORCID: https://orcid.org/0000-0001-9720-5210)
- Xu‐Zhi Zhou (ORCID: https://orcid.org/0000-0003-4953-1761)
- R. E. Ergun (ORCID: https://orcid.org/0000-0002-3096-8579)
- Yixin Hao (ORCID: https://orcid.org/0000-0003-0425-3358)
- Qiugang Zong (ORCID: https://orcid.org/0000-0002-6414-3794)
- Zhi‐Yang Liu (ORCID: https://orcid.org/0000-0003-3800-1044)
- C. J. Pollock (ORCID: https://orcid.org/0000-0001-9228-6605)
- Yixin Sun (ORCID: https://orcid.org/0000-0003-3568-4839)
- Ze‐Fan Yin (ORCID: https://orcid.org/0000-0001-7341-5467)
- Li Li (ORCID: https://orcid.org/0000-0003-4109-4448)
- Shan Wang (ORCID: https://orcid.org/0000-0002-6783-7759)
- Yongfu Wang (ORCID: https://orcid.org/0000-0001-9899-4426)
Institutions
- Macau University of Science and Technology (MO)
- Centre National de la Recherche Scientifique (FR)
- Université Toulouse III - Paul Sabatier (FR)
- Polar Research Institute of China (CN)
- University of California, Los Angeles (US)
- University of Colorado Boulder (US)
- Peking University (CN)
- China University of Geosciences (Beijing) (CN)
- Max Planck Institute for Solar System Research (DE)
- Earth and Space Research (US)
- Institut de Recherche en Astrophysique et Planétologie (FR)
- KTH Royal Institute of Technology (SE)
Publication Details
- Journal
- Geophysical Research Letters
- Published
- 2025-05-22
- DOI
- https://doi.org/10.1029/2025gl115095
- Primary Topic
- Ionosphere and magnetosphere dynamics
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Natural Science Foundation of China