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Quantifying Event-Specific Radial Diffusion Coefficients of Radiation Belt Electrons With the PPMLR-MHD Simulation
Alternative TitleWOS:000540229100002
Li, Li-Fang; Tu, Weichao1; Dai, Lei; Tang, Bin-Bin; Wang, Chi; Barani, Mohammad1,2; Zeng, Gang3; Wei, Chao4; Burch, J. L.
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2020
Volume125Issue:5
DOI10.1029/2019JA027634
ISSN2169-9380
Language英语
KeywordPPMLR-MHD simulation radiation belt electrons radial diffusion coefficients ULF WAVE ANALYSIS RELATIVISTIC ELECTRONS INNER MAGNETOSPHERE ACCELERATION DRIVEN FIELD MODE FLUX INJECTION FREQUENCY
AbstractUsing the global Lagrangian version of the piecewise parabolic method-magnetohydrodynamic (PPMLR-MHD) model, we simulate two consecutive storms in December 2015, a moderate storm on 14-15 December and a strong storm on 19-22 December, and calculate the radial diffusion coefficients (D-LL) from the simulated ultralow frequency waves. We find that even though the strong storm leads to more enhanced B-z and E power than the moderate storm, the two storms share in common a lot of features on the azimuthal mode structure and power spectrum of ultralow frequency waves. For both storms, the total B-z and E power is better correlated with the solar wind dynamic pressure in the storm initial phase and more correlated with AE index in the recovery phase. B-z wave power is shown to be mostly distributed in low mode numbers, while E power spreads over a wider range of modes. Furthermore, the B-z and E power spectral densities are found to be higher at higher L regions, with a stronger L dependence in the B-z spectra. The estimated D-LL based on MHD fields shows that inside the magnetopause, the contribution from electric fields is larger than or comparable to that from magnetic fields, and our event-specific MHD-based D-LL can be smaller than some previous empirical D-LL estimations by more than an order of magnitude. At last, by validating against in situ observations from Magnetospheric Multiscale spacecraft, our MHD results are found to generally well reproduce the total B-z fields and wave power for both storms, while the E-phi power is underestimated in the MHD simulations. Key Points PPMLR global MHD modeling is used to obtain the ULF wave characteristics during the 14-15 December 2015 and 19-22 December 2015 storms The estimated ULF wave mode structure and power spectrum are used to physically quantify the radial diffusion coefficients D-LL MHD well produced the background magnetic field and ULF B-z power observed by MMS but underestimated the observed E-phi power
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7606
Collection中国科学院国家空间科学中心
Affiliation1.Chinese Acad Sci, Natl Space Sci Ctr, Beijing, Peoples R China
2.West Virginia Univ, Dept Phys & Astron, Morgantown, WV 26506 USA
3.Natl Ctr Atmospher Res, High Altitude Observ, Pob 3000, Boulder, CO 80307 USA
4.Harbin Inst Technol, Sch Sci, Shenzhen, Peoples R China
5.Univ Chinese Acad Sci, Beijing, Peoples R China
6.Burch, J. L.] Southwest Res Inst, San Antonio, TX USA
Recommended Citation
GB/T 7714
Li, Li-Fang,Tu, Weichao,Dai, Lei,et al. Quantifying Event-Specific Radial Diffusion Coefficients of Radiation Belt Electrons With the PPMLR-MHD Simulation[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2020,125(5).
APA Li, Li-Fang.,Tu, Weichao.,Dai, Lei.,Tang, Bin-Bin.,Wang, Chi.,...&Burch, J. L..(2020).Quantifying Event-Specific Radial Diffusion Coefficients of Radiation Belt Electrons With the PPMLR-MHD Simulation.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,125(5).
MLA Li, Li-Fang,et al."Quantifying Event-Specific Radial Diffusion Coefficients of Radiation Belt Electrons With the PPMLR-MHD Simulation".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 125.5(2020).
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