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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/00216208:11320/25:10510556

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Geophysical Research Letters

ISSN

0094-8276

e-ISSN

1944-8007

Svazek periodika

52

Číslo periodika v rámci svazku

18

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

e2025GL116883

Kód UT WoS článku

001573702800001

EID výsledku v databázi Scopus

2-s2.0-105016560809