Nonlinear Acceleration of Ultrarelativistic Electrons in the Outer Radiation Belt Disrupted by Transverse Wave Modulations

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F25%3A00639467" target="_blank" >RIV/68378289:_____/25:00639467 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/25:10510556
Result on the web
<a href="https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2025GL116883" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2025GL116883</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1029/2025GL116883" target="_blank" >10.1029/2025GL116883</a>

Result language
angličtina
Original language name
Nonlinear Acceleration of Ultrarelativistic Electrons in the Outer Radiation Belt Disrupted by Transverse Wave Modulations
Original language description
Whistler-mode waves scatter ultrarelativistic electrons in the radiation belts and accelerate them through resonant interactions. In simplified models, nonlinear phase trapping by high-amplitude waves can increase electron energy by several MeV within seconds. However, the acceleration rate in realistic wave packets is slower due to small-scale wave field structures reducing trapping efficiency. While previous studies focused on short field-aligned amplitude modulations and phase jumps, we examine the effects of transverse modulations, which have been observed to reach scales comparable to ultrarelativistic electron gyroradii. Using test-particle simulations, we demonstrate that these modulations disrupt the acceleration process. Our numerical results suggest that nonlinear trapping plays a negligible role in accelerating electrons above a certain energy limit, reinforcing the diffusive nature of wave-driven electron transport at multi-MeV energies. Unlike field-aligned structures, transverse phase incoherence modifies the effective wave spectrum and allows for resonance, making amplitude modulations a necessary component for suppression of acceleration.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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