Fig. 4: | Nature Communications

Fig. 4

From: A hexagon in Saturn’s northern stratosphere surrounding the emerging summertime polar vortex

Fig. 4

North and South polar stratospheric temperature gradients as a function of time throughout the whole Cassini mission, 2004–2017. We display north polar temperatures (ac), north polar windshears (df), south polar windshears (gi) and south polar temperatures (jl) at three different pressure levels (0.5, 1.0 and 5.0 mbar). These were derived from averages of low-resolution CIRS spectra on a monthly temporal grid and interpolated using tensioned splines43 to reconstruct a smoothed temperature field. Horizontal dashed lines signify the peak of eastward zonal jets in the troposphere9. The data are displayed as a function of time (years), but a second horizontal axis provides the planetocentric solar longitude (Ls) in degrees