Estimating quasi-linear diffusion coefficients for varying values of density ratio

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dc.citation.articleNumber1470742en_US
dc.citation.journalTitleFrontiers in Astronomy and Space Sciencesen_US
dc.citation.volumeNumber11en_US
dc.contributor.authorAlbert, Jay M.en_US
dc.contributor.authorLongley, William J.en_US
dc.contributor.authorChan, Anthony A.en_US
dc.date.accessioned2025-01-09T20:17:01Zen_US
dc.date.available2025-01-09T20:17:01Zen_US
dc.date.issued2024en_US
dc.description.abstractThis paper considers a method for estimating bounce-averaged quasi-linear diffusion coefficients due to whistler-mode waves for a specified ratio of plasma frequency to gyrofrequency, ωp/Ωe, using values precomputed for a different value of that ratio. This approach was recently introduced to facilitate calculations associated with the “POES technique,” generalized to infer both wave intensity and cold plasma density from measurements of particle fluxes near the loss cone. The original derivation was justified on the basis of parallel-propagating waves but applied to calculations with much more general models of the waves. Here, we justify the estimates, which are based on equating resonant frequencies for differing values of ωp/Ωe and energy, for wide ranges of wave normal angle, resonance number, energy, and equatorial pitch angle. Refinements of the original estimates are obtained and tested numerically against full calculations of the diffusion coefficients for representative wave models. The estimated diffusion coefficients can be calculated rapidly and generally give useful estimates for energies in the 30-keV–300-keV range, especially when both relevant values of the ratio ωp/Ωe are large.en_US
dc.identifier.citationAlbert, J. M., Longley, W. J., & Chan, A. A. (2024). Estimating quasi-linear diffusion coefficients for varying values of density ratio. Frontiers in Astronomy and Space Sciences, 11. https://doi.org/10.3389/fspas.2024.1470742en_US
dc.identifier.digitalfspas-2-1470742en_US
dc.identifier.doihttps://doi.org/10.3389/fspas.2024.1470742en_US
dc.identifier.urihttps://hdl.handle.net/1911/118130en_US
dc.language.isoengen_US
dc.publisherFrontiers Media S.A.en_US
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.subject.keywordwave–particle interactionsen_US
dc.subject.keywordradiation beltsen_US
dc.subject.keywordquasi-linearen_US
dc.subject.keyworddiffusionen_US
dc.subject.keywordPOES techniqueen_US
dc.titleEstimating quasi-linear diffusion coefficients for varying values of density ratioen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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