Semi-annual oscillations in Saturn’s low-latitude stratospheric temperatures

Both Earth and Jupiter have equatorial oscillations in their atmospheres, with two-year and four-year periodicity respectively. Two groups working independently now report a related phenomenon on Saturn. Orton et al. analysed wo decades of ground-based observations of Saturn's stratospheric emissions to reveal an oscillation with a period of 14.8±1.2 terrestrial years. This is roughly half of Saturn's year, suggesting seasonal forcing, as is the case with the Earth's semiannual oscillation. Fouchet et al. used infrared spectrometry data from the Cassini probe to detect a similar equatorial oscillation.