Fig. 1From: The development and validation of a ‘flux-corrected transport’ based solution methodology for the plasmasphere refilling problem following geomagnetic stormsThe schematic of a flux tube after a geomagnetic storm, where the ionosphere is shown by hatched lines. The depleted flux tube lies above the ionosphere. The symbols θ and r represent colatitude and geocentric distance, respectively, and S =+ Smax show the boundaries in the conjugate ionospheres (Singh et al. 1986; Rasmussen and Schunk 1988)Back to article page