Solar electron beam--Langmuir wave interactions and how they modify solar electron beam spectra: Solar Orbiter observations of a match made in the heliosphere
Authors
Lorfing, Camille; Reid, Hamish A. S.; Gómez Herrero, Raúl; Maksimovic, Milan; Nicolaou, Georgios; [et al.]Identifiers
Permanent link (URI): http://hdl.handle.net/10017/60962DOI: 10.3847/1538-4357/ad0be3
ISSN: 0004-637X
Publisher
IOP Publishing
Date
2023-12-14Funders
Agencia Estatal de Investigación
European Commission
Bibliographic citation
Lorfing, C. [et al.], 2023, "Solar electron beam--Langmuir wave interactions and how they modify solar electron beam spectra: Solar Orbiter observations of a match made in the heliosphere", Astrophysical Journal, vol. 959, no. 2, pp. 1-11.
Project
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ESP2017-88436-R/ES/ENERGETIC PARTICLE DETECTOR EN SOLAR ORBITER: FASES D Y E/
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-104863RB-I00/ES/ENERGETIC PARTICLE DETECTOR EN SOLAR ORBITER: FASE E, CALIBRACION Y EXPLOTACION DE DATOS/
info:eu-repo/grantAgreement/EC/H2020/101004159/EU/Solar EneRgetic ParticlE aNalysis plaTform for the INner hEliosphere/SERPENTINE
Document type
info:eu-repo/semantics/article
Version
info:eu-repo/semantics/publishedVersion
Publisher's version
https://doi.org/10.3847/1538-4357/ad0be3Rights
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
© 2023 The authors
Access rights
info:eu-repo/semantics/openAccess
Abstract
Solar Orbiter's four in situ instruments have recorded numerous energetic electron events at heliocentric distances between 0.5 and 1 au. We analyze energetic electron fluxes, spectra, pitch-angle distributions, associated Langmuir waves, and type III solar radio bursts for three events to understand what causes modifications in the electron flux and identify the origin and characteristics of features observed in the electron spectrum. We investigate what electron beam properties and solar wind conditions are associated with Langmuir wave growth and spectral breaks in the electron peak flux as a function of energy. We observe velocity dispersion and quasilinear relaxation in the electron flux caused by the resonant wave–particle interactions in the deca-keV range, at the energies at which we observe breaks in the electron spectrum, cotemporal with the local generation of Langmuir waves. We show, via the evolution of the electron flux at the time of the event, that these interactions are responsible for the spectral signatures observed around 10 and 50 keV, confirming the results of simulations by Kontar and Reid. These signatures are independent of pitch-angle scattering. Our findings highlight the importance of using overlapping FOVs when working with data from different sensors. In this work, we exploit observations from all in situ instruments to address, for the first time, how the energetic electron flux is modified by the beam–plasma interactions and results in specific feature appearing in the local spectrum. Our results, corroborated with numerical simulations, can be extended to a wider range of heliocentric distances.
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Solar_Lorfing_Astrophys_J_2023.pdf | 1.529Mb |
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