ULF Wave Radial Diffusion Coefficients

Hourly radial diffusion coefficients, DLL, derived from ground-based magnetometer measurements from March 16 to March 20, 2015 in units of days-1. The DLL values are plotted out at 100 equally spaced L* values from L*=1 to L*=5 derived from the TS05 magnetic field model at K=0 G1/2Re. These DLL values are used to reproduce the the evolution of the electron phase space density profiles in the Earth's outer radiation belt during the March 2015 geomagnetic storm presented in:

Ozeke et al., The March 2015 Superstorm Revisited: Phase Space Density Profiles and Fast ULF Wave Diffusive Transport, Journal of Geophysical Research, 2019, submitted.

The attached plot shows a comparison of these event specific diffusion coefficient with those obtained from the empirical models of:

Brautigam, D. H., and J. M. Albert (2000), Radial diffusion analysis of outer radiation belt electrons during the October 9, 1990, magnetic storm, J. Geophys. Res., 105(A1), 291–309, doi:10.1029/1999JA900344.

and

Ozeke, L. G., I. R. Mann, K. R. Murphy, I. Jonathan Rae, and D. K. Milling (2014), Analytic expressions for ULF wave radiation belt radial diffusion coefficients, J. Geophys. Res. Space Physics, 119, 1587–1605, doi:10.1002/2013JA019204.