Articles A survey of the polar cap density based on Cluster EFW probe measurements: Solar wind and solar irradiation dependence
Haaland, Stein; Svenes, Knut Ragnar; Lybekk, Bjørn; Pedersen, Arne. A survey of the polar cap density based on Cluster EFW probe measurements: Solar wind and solar irradiation dependence. Journal of Geophysical Research - Space Physics 2012 ;Volum 117.