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dc.contributor.authorAllanson, Oliver
dc.contributor.authorMa, Donglai
dc.contributor.authorOsmane, Adnane
dc.contributor.authorAlbert, Jay
dc.contributor.authorBortnik, Jacob
dc.contributor.authorWatt, Clare
dc.contributor.authorChapman, Sandra
dc.contributor.authorSpencer, John
dc.contributor.authorRatliff, Daniel
dc.contributor.authorMeredith, Nigel
dc.contributor.authorElsden, Tom
dc.contributor.authorNeukirch, Thomas
dc.contributor.authorHartley, David
dc.contributor.authorBlack, Rachel
dc.contributor.authorWatkins, Nicholas
dc.contributor.authorElvidge, Sean
dc.identifier.citationAllanson , O , Ma , D , Osmane , A , Albert , J , Bortnik , J , Watt , C , Chapman , S , Spencer , J , Ratliff , D , Meredith , N , Elsden , T , Neukirch , T , Hartley , D , Black , R , Watkins , N & Elvidge , S 2024 , ' The challenge to understand the zoo of particle transport regimes during resonant wave-particle interactions for given survey-mode wave spectra ' , Frontiers in Astronomy and Space Sciences , vol. 11 , 1332931 .
dc.identifier.otherORCID: /0000-0002-1910-2010/work/155626290
dc.identifier.otherORCID: /0000-0002-7597-4980/work/155626563
dc.descriptionOA would like to acknowledge financial support from the University of Birmingham, the University of Exeter, and also from the United Kingdom Research and Innovation (UKRI) Natural Environment Research Council (NERC) Independent Research Fellowship NE/V013963/1 and NE/V013963/2, and the UKRI NERC GW4+ DTP2 studentship project (4253) 2697077. OA and CEJW acknowledge financial support from the NERC Highlight Topic Grant NE/P017274/1 (Rad-Sat), and from United Kingdom Science and Technology Facilities Council (STFC) via Consolidated Grant ST/W000369/1. DM and JB would like to gratefully acknowledge support from NASA award 80NSSC20K1270 and NASA/CCMC award 80NSSC23K0324. JB would like to acknowledge NSF/GEM award 2025706 and DM further acknowledges the UCLA Dissertation Year Fellowship. Support for AO was provided by the Academy of Finland profiling action Matter and Materials (grant # 318913). JA acknowledges support from AFOSR grant 2022RVCOR002. NPM would like to acknowledge funding from the Natural Environment Research Council grants NE/V00249X/1 (Sat-Risk), NE/R016038/1 and NE/X000389/1. RB would like to acknowledge the UKRI NERC GW4+ DTP2 studentship project (4253) 2697077. DR is grateful to the Isaac Newton Institute for Mathematical Sciences, Cambridge, for support and hospitality during the programme Dispersive Hydrodynamics where work on this paper was undertaken. DR was also supported by Engineering and Physical Sciences Research Council (EPSRC) grant no EP/R014604/1. SC acknowledges support from ISSI via the J. Geiss fellowship. SC and NW acknowledge support from the AFOSR grant FA8655-22-1-7056. TE and TN acknowledge support from UKRI Science and Technology Facilities Council (STFC) consolidated grant number ST/W001195/1. Support for DPH was provided by NASA grants 80NSSC21K0519 and 80NSSC20K1324. SE aknowledges support from the United Kingdom Space Weather Instrumentation, Measurement, Modelling and Risk (SWIMMR) Programme, Natural Environment Research Council (NERC) Grant NE/V002708/1.en
dc.description.abstractQuasilinear theories have been shown to well describe a range of transport phenomena in magnetospheric, space, astrophysical and laboratory plasma “weak turbulence” scenarios. It is well known that the resonant diffusion quasilinear theory for the case of a uniform background field may formally describe particle dynamics when the electromagnetic wave amplitude and growth rates are sufficiently “small”, and the bandwidth is sufficiently “large”. However, it is important to note that for a given wave spectrum that would be expected to give rise to quasilinear transport, the quasilinear theory may indeed apply for given range of resonant pitch-angles and energies, but may not apply for some smaller, or larger, values of resonant pitch-angle and energy. That is to say that the applicability of the quasilinear theory can be pitch-angle dependent, even in the case of a uniform background magnetic field. If indeed the quasilinear theory does apply, the motion of particles with different pitch-angles are still characterised by different timescales. Using a high-performance test-particle code, we present a detailed analysis of the applicability of quasilinear theory to a range of different wave spectra that would otherwise “appear quasilinear” if presented by e.g., satellite survey-mode data. We present these analyses as a function of wave amplitude, wave coherence and resonant particle velocities (energies and pitch-angles), and contextualise the results using theory of resonant overlap and small amplitude criteria. In doing so, we identify and classify five different transport regimes that are a function of particle pitch-angle. The results in our paper demonstrate that there can be a significant variety of particle responses (as a function of pitch-angle) for very similar looking survey-mode electromagnetic wave products, even if they appear to satisfy all appropriate quasilinear criteria. In recent years there have been a sequence of very interesting and important results in this domain, and we argue in favour of continuing efforts on: (i) the development of new transport theories to understand the importance of these, and other, diverse electron responses; (ii) which are informed by statistical analyses of the relationship between burst- and survey-mode spacecraft data.
dc.relation.ispartofFrontiers in Astronomy and Space Sciencesen
dc.subjectSpace plasmaen
dc.subjectPlasma wavesen
dc.subjectWave-particle interactionsen
dc.subjectQuasilinear theoryen
dc.subjectRadiation beltsen
dc.subjectQB Astronomyen
dc.titleThe challenge to understand the zoo of particle transport regimes during resonant wave-particle interactions for given survey-mode wave spectraen
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.contributor.institutionUniversity of St Andrews. Applied Mathematicsen
dc.description.statusPeer revieweden

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