What is "hadley cell"

The Hadley cell, named after George Hadley, is a tropical atmospheric circulation that features air rising near the equator, flowing poleward at 10–15 kilometers above the surface, descending in the subtropics, and then flowing equatorward near the surface. This circulation creates the trade winds, tropical rain-belts and hurricanes, subtropical deserts and the jet streams.

There is one primary circulation cell known as a Hadley cell and two secondary circulation cells at higher latitudes, known as the Ferrel cell, and Polar cell.