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

doi:10.1029/2022JA030602

	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.
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2022-09
卷号	127 期号:9
ISSN	2169-9380
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.
关键词	outer radiation belt flux dropouts CIRs MHD simulation event-specific D-LL case studies
学科领域	Astronomy & Astrophysics
DOI	10.1029/2022JA030602
收录类别	SCI
语种	英语
WOS记录号	WOS:000855135400001
项目资助者	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]
论文分区	二类
力学所作者排名	1
RpAuthor	Silva, GBD (corresponding author), Natl Inst Space Res INPE, Sao Jose Dos Campos, Brazil.
引用统计
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/90183
专题	高温气体动力学国家重点实验室
作者单位	1.[Silva, G. B. D. 2.Alves, L. R. 3.Padilha, A. L. 4.Souza, V. M. 5.Padua, M. B.] Natl Inst Space Res INPE, Sao Jose Dos Campos, Brazil 6.[Tu, W. 7.Lyu, X.] West Virginia Univ, Dept Phys & Astron, Morgantown, WV 26506 USA 8.Chinese Acad Sci, Inst Mech, Beijing, Peoples R China
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,2022,127,9,.
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(9).
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 127.9(2022).

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