Using MEPED observations to infer plasma density and chorus intensity in the radiation belts

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dc.citation.articleNumber1063329en_US
dc.citation.journalTitleFrontiers in Astronomy and Space Sciencesen_US
dc.citation.volumeNumber9en_US
dc.contributor.authorLongley, William J.en_US
dc.contributor.authorChan, Anthony A.en_US
dc.contributor.authorJaynes, Allison N.en_US
dc.contributor.authorElkington, Scot R.en_US
dc.contributor.authorPettit, Joshua M.en_US
dc.contributor.authorRoss, Johnathan P. J.en_US
dc.contributor.authorGlauert, Sarah A.en_US
dc.contributor.authorHorne, Richard B.en_US
dc.date.accessioned2023-01-27T14:47:27Zen_US
dc.date.available2023-01-27T14:47:27Zen_US
dc.date.issued2022en_US
dc.description.abstractEfforts to model and predict energetic electron fluxes in the radiation belts are highly sensitive to local wave-particle interactions. In this study, we use multi-point measurements of precipitating and trapped electron fluxes to investigate the dynamic variation of chorus wave-particle interactions during the 17 March 2013 storm. Quasilinear theory characterizes the chorus wave-particle interaction as a diffusive process, with the diffusion coefficients depending on the particle energy and pitch angle, as well as the background plasma parameters such as the wave intensity and plasma density. These plasma parameters in the radiation belts are spatially localized and time-varying, so we construct event-specific diffusion coefficients using MEPED (onboard POES/MetOp) measurements of electron fluxes at low Earth orbit. This new method provides realistic diffusion coefficients for chorus waves that account for changes in the wave intensity, the plasma density, and the magnetic field strength in the outer radiation belt. We show that the inferred chorus intensity is significantly lower than previous estimates that use MEPED observations since the same amount of increased precipitation by 30–300 keV electrons can be explained by a change in the plasma density. This technique therefore allows for us to create time varying, global maps of the plasma-gyrofrequency ratio (fpe/fce), and therefore plasma density, in the outer radiation belts using the MEPED measurements. The global density estimates compare reasonably well to in situ density measurements from RBSP-B.en_US
dc.identifier.citationLongley, William J., Chan, Anthony A., Jaynes, Allison N., et al.. "Using MEPED observations to infer plasma density and chorus intensity in the radiation belts." <i>Frontiers in Astronomy and Space Sciences,</i> 9, (2022) Frontiers Media S.A.: https://doi.org/10.3389/fspas.2022.1063329.en_US
dc.identifier.digitalfspas-09-1063329en_US
dc.identifier.doihttps://doi.org/10.3389/fspas.2022.1063329en_US
dc.identifier.urihttps://hdl.handle.net/1911/114277en_US
dc.language.isoengen_US
dc.publisherFrontiers Media S.A.en_US
dc.rightsThis is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.titleUsing MEPED observations to infer plasma density and chorus intensity in the radiation beltsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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