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Theories of Growth and Propagation of Parallel Whistler-Mode Chorus Emissions: A Review
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SYSNO ASEP 0573219 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Theories of Growth and Propagation of Parallel Whistler-Mode Chorus Emissions: A Review Author(s) Hanzelka, Miroslav (UFA-U) ORCID, RID
Santolík, Ondřej (UFA-U) RID, ORCIDNumber of authors 2 Source Title Surveys in Geophysics. - : Springer - ISSN 0169-3298
Roč. 45, č. 1 (2024), s. 1-54Number of pages 54 s. Language eng - English Country DE - Germany Keywords Chorus emission ; Whistler mode ; Nonlinear growth ; Wave-particle interactions ; Resonant current ; Cyclotron resonance ; Space plasma ; Plasma waves ; Sideband instability ; Backwards-wave oscillator Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Method of publishing Open access Institutional support UFA-U - RVO:68378289 UT WOS 001000326800001 EID SCOPUS 85160832199 DOI https://doi.org/10.1007/s10712-023-09792-x Annotation The significant role of nonlinear wave-particle interactions in the macrodynamics and microdynamics of the Earth's outer radiation belt has long been recognised. Electron dropouts during magnetic storms, microbursts in atmospheric electron precipitation, and pulsating auroras are all associated with the rapid scattering of energetic electrons by the whistler-mode chorus, a structured electromagnetic emission known to reach amplitudes of about 1% of the ambient magnetic field. Despite the decades of experimental and theoretical investigations of chorus and the recent progress achieved through numerical simulations, there is no definitive theory of the chorus formation mechanism, not even in the simple case of parallel (one-dimensional) propagation. Here we follow the evolution of these theories from their beginnings in the 1960s to the current state, including newly emerging self-consistent excitation models. A critical review of the unique features of each approach is provided, taking into account the most recent spacecraft observations of the fine structure of chorus. Conflicting interpretations of the role of resonant electron current and magnetic field inhomogeneity are discussed. We also discuss the interplay between nonlinear growth and microscale propagation effects and identify future theoretical and observational challenges stemming from the two-dimensional aspects of chorus propagation. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2025 Electronic address https://link.springer.com/article/10.1007/s10712-023-09792-x
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