Comparison between the detections of jets during TRAPPIST observations with previous studies of the brightness of components of the Jovian magnetosphere for the period surrounding the 2014–2015 viewing campaign. Data has been extracted from figures in the reference works. Jets identified in this work have been annotated by solid green lines, and observations made of Io with no detected jets have been annotated by a broken grey line. Orange lines denote the exceptional jets of 4 December 2014 and 6 December 2014. Top: the brightness of the extended sodium nebula in the sodium-doublet waveband, as taken from Fig. 1 of Yoneda et al. (2015). The legend refers to the distance from Jupiter at which the measurements were obtained (1 R_J = 1 Jupiter radius). Bottom: the brightness of the Io plasma torus in several sulphurion wavebands, as taken from Fig. 3 of Yoshikawa et al. (2017). The legend refers to the ionisation levels of the sulphur ions.