# Coriolis frequency

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The Coriolis frequency ƒ, also called the Coriolis parameter or Coriolis coefficient,[1] is equal to twice the rotation rate Ω of the Earth multiplied by the sine of the latitude φ.

$f = 2 \Omega \sin \varphi.\,$

The rotation rate of the Earth (Ω = 7.2921 × 10−5 rad/s) can be calculated as 2π / T radians per second, where T is the rotation period of the Earth which is one sidereal day (23 hr 56 m 4.1 s). In the midlatitudes, the typical value for $f$ is about 10−4 rad/s. Inertial oscillations on the surface of the earth have this frequency. These oscillations are the result of the Coriolis effect.

## References

1. ^ Vallis, Geoffrey K. (2006). Atmospheric and oceanic fluid dynamics : fundamentals and large-scale circulation (Reprint. ed.). Cambridge: Cambridge University Press. ISBN 978-0-521-84969-2.