Coriolis frequency

The Coriolis frequency ƒ, also called the Coriolis parameter or Coriolis coefficient, is equal to twice the rotation rate Ω of the Earth multiplied by the sine of the latitude ${\displaystyle \varphi }$.

${\displaystyle f=2\Omega \sin \varphi .\,}$

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 h 56 min 4.1 s). In the midlatitudes, the typical value for ${\displaystyle f}$ 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.