Which hemisphere does the sub-tropical jet stream occur in?

The sub-tropical jet stream is a fast-flowing air current that occurs at high altitudes and typically forms in the upper troposphere, around the boundaries between the tropics and the mid-latitudes. This jet stream is found in both the Northern and Southern Hemispheres, typically between latitudes 20° and 40° in each hemisphere.

The existence of the sub-tropical jet stream in both hemispheres is due to the similar atmospheric dynamics that arise from the distribution of solar heating and the Earth's rotation. This jet stream influences weather patterns by affecting the movement of air masses and the development of storms.

In contrast, the other options each describe a limited or incorrect understanding of the jet stream's occurrence. The sub-tropical jet stream is not confined to a single hemisphere or solely in the equatorial region, as it is a feature of the entire planet's atmospheric circulation system.