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Abstract Results from the recently completed Cassini mission (Guerlet et al., 2018, https://doi.org/10.1002/2017JE005419 ) have demonstrated that Saturn's tropical stratosphere hosts an intriguing oscillation in its zonal (east‐west) flow that is a direct analog of the Earth's stratospheric quasi‐biennial oscillation or semiannual oscillation. The new results represent a significant advance in characterizing this phenomenon on Saturn, though a number of difficult questions are still outstanding. Is Saturn's equatorial oscillation phase‐locked to its seasonal cycle? How many other planets in our Solar System might host such analogs of the quasi‐biennial oscillation?
P. L. Read (Tue,) studied this question.