Rossby-gravity waves
Equatorially trapped waves that carry energy eastwards / From Wikipedia, the free encyclopedia
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Rossby-gravity waves are equatorially trapped waves (much like Kelvin waves), meaning that they rapidly decay as their distance increases away from the equator (so long as the Brunt–Vaisala frequency does not remain constant). These waves have the same trapping scale as Kelvin waves, more commonly known as the equatorial Rossby deformation radius.[1] They always carry energy eastward, but their 'crests' and 'troughs' may propagate westward if their periods are long enough.