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

Author
Keywords
Abstract
The 17\textendash18 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\textendash8.3 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.
Year of Publication
2016
Journal
Journal of Geophysical Research: Space Physics
Date Published
07/2016
URL
http://doi.wiley.com/10.1002/2016JA022508
DOI
10.1002/2016JA022508