Modeling Radiation Belt Electron Dropouts During Moderate Geomagnetic Storms Using Radial Diffusion Coefficients Estimated With Global MHD Simulations

doi:10.1029/2022JA030602

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	Modeling Radiation Belt Electron Dropouts During Moderate Geomagnetic Storms Using Radial Diffusion Coefficients Estimated With Global MHD Simulations
	Silva, G. B. D.; Alves, L. R.; Tu, W.; Padilha, A. L.; Souza, V. M.; Li, LF ; Lyu, X.; Padua, M. B.
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS ; 9
	2022-09
卷号	127
关键词	outer radiation belt flux dropouts CIRs MHD simulation event-specific D-LL case studies
ISSN号	2169-9380
DOI	10.1029/2022JA030602
英文摘要	Main phase flux dropouts often promote depletion of the outer electron radiation belt. The quantification of the contributions of various loss mechanisms to MeV electron dropouts has not yet been elucidated in detailed case studies for moderate geomagnetic storms. This work focuses on quantifying radial diffusion to study relativistic electron flux losses observed by Van Allen Probes during two moderate storms in 2017. The events are identified as Case 1 (27 March), with losses deep in L, and Case 2 (21 11ember), with less deep losses. Event-specific radial diffusion coefficients (D-LL) were calculated from global magnetohydrodynamic (MHD) fields simulated by the SWMF/BATS-R-US. The MHD-D-LL was used as an input to radial diffusion simulations of both events for relativistic electrons. For the outer boundary conditions defined at L* = 6, electron fluxes measured by GOES-15 at geosynchronous orbit were converted to phase space densities (PSDs) and then calibrated against the Van Allen Probe A measurements. Using these calibrated PSD of GOES-15 at the outer boundary and event-specific MHD-D-LL, the main phase dropout is well captured with radial diffusion simulation for Case 2, but not for the deep dropout in Case 1 down to L* < 4.5. Scaling MHD-D-LL based on validations of the MHD waves against in situ wave observations improves the simulation results of Case 1, but still does not fully resolve its deep dropout. However, analyzing the uncertainty of simulated PSD imposed by the uncertainty in the scaled MHD-D-LL, it was found that outward radial diffusion could still account for the losses at L* < 4.5.
学科主题	Astronomy & Astrophysics
分类号	二类
语种	英语
WOS记录号	WOS:000855135400001
资助机构	CNPq [300342/2022-5, 143011/2017-0, 317953/2021-4, 300282/2022-2] ; CAPES-PrInt [88887.363809/2019-00] ; NSF [AGS 1752736] ; NASA [80NSSC19K0908, 80NSSC21K1312, 80NSSC21K2008]
其他责任者	Silva, GBD (corresponding author), Natl Inst Space Res INPE, Sao Jose Dos Campos, Brazil.
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/90183]
专题	力学研究所_高温气体动力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, Beijing, Peoples R China 2.Lyu, X.] West Virginia Univ, Dept Phys & Astron, Morgantown, WV 26506 USA 3.[Tu, W. 4.Padua, M. B.] Natl Inst Space Res INPE, Sao Jose Dos Campos, Brazil 5.Souza, V. M. 6.Padilha, A. L. 7.Alves, L. R. 8.[Silva, G. B. D.
推荐引用方式 GB/T 7714	Silva, G. B. D.,Alves, L. R.,Tu, W.,et al. Modeling Radiation Belt Electron Dropouts During Moderate Geomagnetic Storms Using Radial Diffusion Coefficients Estimated With Global MHD Simulations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 9,2022,127.
APA	Silva, G. B. D..,Alves, L. R..,Tu, W..,Padilha, A. L..,Souza, V. M..,...&Padua, M. B..(2022).Modeling Radiation Belt Electron Dropouts During Moderate Geomagnetic Storms Using Radial Diffusion Coefficients Estimated With Global MHD Simulations.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,127.
MLA	Silva, G. B. D.,et al."Modeling Radiation Belt Electron Dropouts During Moderate Geomagnetic Storms Using Radial Diffusion Coefficients Estimated With Global MHD Simulations".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 127(2022).