Radio emissions reveal Alfvénic activity and electron acceleration prior to substorm onset

S. Y. Wu (), D. K. Whiter, L. Lamy, M. M. Wang, P. Zarka, C. M. Jackman, S. Y. Ye, J. E. Waters, A. R. Fogg, S. B. Mende, N. Kaweeyanun, Y. Kasaba, S. Kurita, H. Kojima, L. J. Paxton, Y. Kasahara, Y. Miyoshi, A. Shinbori and F. Tsuchiya
Additional contact information
S. Y. Wu: University of Southampton, School of Physics and Astronomy
D. K. Whiter: University of Southampton, School of Physics and Astronomy
L. Lamy: LAM, Aix Marseille University, CNRS, CNES
M. M. Wang: Swedish Institute of Space Physics
P. Zarka: Université Paris Cité, LIRA, Observatoire de Paris, CNRS, PSL, Sorbonne Université
C. M. Jackman: Dublin Institute for Advanced Studies, School of Cosmic Physics, DIAS Dunsink Observatory
S. Y. Ye: Southern University of Science and Technology, Department of Earth and Space Sciences
J. E. Waters: Université Paris Cité, LIRA, Observatoire de Paris, CNRS, PSL, Sorbonne Université
A. R. Fogg: Dublin Institute for Advanced Studies, School of Cosmic Physics, DIAS Dunsink Observatory
S. B. Mende: University of California, Space Science Laboratory
N. Kaweeyanun: University of Southampton, School of Physics and Astronomy
Y. Kasaba: Aoba, Planetary Plasma and Atmospheric Research Center, Graduate School of Science, Tohoku University
S. Kurita: Kyoto University, Research Institute for Sustainable Humanosphere
H. Kojima: Kyoto University, Research Institute for Sustainable Humanosphere
L. J. Paxton: The Johns Hopkins University Applied Physics Laboratory
Y. Kasahara: Kanazawa University, Graduate School of Natural Science and Technology
Y. Miyoshi: Nagoya University, Institute for Space-Earth Environmental Research, Nagoya University Graduate School of Engineering
A. Shinbori: Nagoya University, Institute for Space-Earth Environmental Research, Nagoya University Graduate School of Engineering
F. Tsuchiya: Aoba, Planetary Plasma and Atmospheric Research Center, Graduate School of Science, Tohoku University

Nature Communications, 2025, vol. 16, issue 1, 1-14

Abstract: Abstract Magnetospheric substorms are among the most dynamic phenomena in the Earth’s magnetosphere, yet their triggering mechanisms remain unclear. Ground-based observations have identified wave-like aurora as precursors to substorms. Here, we report a new precursor feature in space-based observations of auroral kilometric radiation (AKR), marked by the appearance of emissions with slowly frequency-drifting tones (

Date: 2025
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DOI: 10.1038/s41467-025-65580-8

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