Ozeke, LG;    Mann, IR;    Murphy, KR;    Jonathan Rae, I;    Milling, DK;      (2014)    Analytic expressions for ULF wave radiation belt radial diffusion coefficients.                   Journal of Geophysical Research A: Space Physics , 119  (3)   1587 - 1605.    10.1002/2013JA019204 <https://doi.org/10.1002/2013JA019204>.       Green open access