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Global ULF wave analysis of radial diffusion coefficients using a global MHD model for the 17 March 2015 storm

Global ULF wave analysis of radial diffusion coefficients using a global MHD model for the 17 March 2015 storm

Authors :
Li, Zhao
Hudson, Mary
Paral, Jan
Wiltberger, Michael
Turner, Drew
Source :
Journal of Geophysical Research - Space Physics; July 2016, Vol. 121 Issue: 7 p6196-6206, 11p
Publication Year :
2016

Abstract

The 17–18 March 2015 storm is the largest geomagnetic storm in the Van Allen Probes era to date. The Lyon-Fedder-Mobarry global MHD model has been run for this event using ARTEMIS data as solar wind input. The ULF wave power spectral density of the azimuthal electric field and compressional magnetic field is analyzed in the 0.5–8.3 mHz range. The lowest three azimuthal modes account for 70% of the total power during quiet times. However, during high activity, they are not exclusively dominant. The calculation of the radial diffusion coefficient is presented. We conclude that the electric field radial diffusion coefficient is dominant over the magnetic field coefficient by one to two orders of magnitude. This result contrasts with the dominant magnetic field diffusion coefficient used in most 3-D diffusion models. LFM global MHD model is run and ULF wave power spectrum is analyzed for March 2015 stormThe lowest three azimuthal modes account for 70% of the total ULF power during quiet times but not exclusively dominant during active timesThe electric field radial diffusion coefficient is dominant over the magnetic field coefficient by one to two orders of magnitude

Details

Language :
English
ISSN :
21699380 and 21699402
Volume :
121
Issue :
7
Database :
Supplemental Index
Journal :
Journal of Geophysical Research - Space Physics
Publication Type :
Periodical
Accession number :
ejs42501872
Full Text :
https://doi.org/10.1002/2016JA022508