J Geophys Res A Wu XY, Horwitz JL, Seo Y. Statistical analysis of F region and topside ionospheric ion field-aligned flows at high latitudes. J Geophys Res A. 2000; 105(A2):2477-2494. 2000 https://researcherprofiles.org/profile/1334894 Wu XY, Horwitz JL, Seo Y