Before revision: Equatorial Rossby waves, often called planetary waves, are very long, low frequency waves found near the equator and are derived using the equatorial Beta plane approximation, , where "β" is the variation of the Coriolis parameter with latitude () .
After revision: Equatorial Rossby waves, often called planetary waves, are very long, low frequency waves found near the equator and are derived using the equatorial Beta plane approximation, , where "β" is the variation of the Coriolis parameter with latitude , .