This scale is the standard for everyday use in the United States. This net downward transport of positive charge occurs in a current between 1,350 to 1,800 amperes over the entire Earth's surface. If lightning did not occur continuously, the Earth-ionosphere capacitor would lose its current in less than 10 minutes. This type of process is often referred to as a feedback mechanism.
Climate feedbacks can amplify the response of the system to an externally imposed perturbation.
Ferrel Cell - Indirect meridional cell that is poleward of the tropical Hadley circulation in zonally averaged observations. The equatorward sinking branch is representative of the air motions in the subtropical highs. The poleward and ascending branch corresponds to the stormy region of the polar jet stream. Finite difference methods are used in the approximate numerical solution of ordinary and partial differential equations. For example, strong shear flows tend to be unstable.