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  Scattering of relativistic electrons by oblique EMIC waves: Test-particle and full-wave modeling

Hanzelka, M., Qin, M., Li, W., Capannolo, L., Ma, Q., Gan, L. (2023): Scattering of relativistic electrons by oblique EMIC waves: Test-particle and full-wave modeling, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0733

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016732 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016732_1
Genre: Conference Paper

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 Creators:
Hanzelka, Miroslav1, Author
Qin, Murong1, Author
Li, Wen1, Author
Capannolo, Luisa1, Author
Ma, Qianli1, Author
Gan, Longzhi1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: Electromagnetic ion cyclotron (EMIC) emissions in the Earth’s inner magnetosphere are a significant driver of relativistic electron precipitation into the atmosphere. The amplitudes of EMIC waves often exceed 1 nT, introducing nonlinear effects not included in the diffusive quasi-linear theory. While the nonlinear effects have been previously studied analytically and by test-particle simulations, most studies focus on parallel-propagating monochromatic waves. Here we present results from test-particle simulations of relativistic electrons interacting with EMIC waves of different amplitudes and wave normal angles. Diffusive and advective components of pitch-angle scattering are analyzed, highlighting the important effect of harmonic resonances on both co-streaming and counter-streaming electrons. Backward-in-time simulations are used to obtain the perturbed phase space density distribution and study the loss-cone electron population. It is demonstrated that the net effect of advective and diffusive motion during one quarter-bounce results in near isotropization of the distribution unless the nonlinear phase-trapping effects become dominant. It is further revealed that particles below the fundamental resonance energy experience not only nonresonant scattering caused by the amplitude modulations but also fractional-resonant scattering stemming from nonlinearly perturbed trajectories. Finally, the simple monochromatic wave model with constant obliquity is replaced with a full-wave model based on finite-difference time-domain simulations initialized with waveforms from spacecraft measurements. Differences between the two models are discussed, assessing the limitations of monochromatic models in the analysis of relativistic electron scattering and precipitation.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-0733
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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