what is this last mentioned thing?
It is a specific case of a planetary equator. It is about long, of which 78.8% lies across water and 21.3% over land.
Equator
Earth's Equator, spelled with capital E, is a specific case of a planetary equator. It is about long, of which 78.8% lies across water and 21.3% over land.

we would expect what with low pressure in the northern hemisphere Large polar cyclones what is this aforesaid area? It is the half of Earth that is north of the Equator.
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Equator [SEP] Introduction
When the Sun is directly above the Earth's Equator (on the equinoxes of approximately March 20 and September 23), sunlight shines perpendicular to the Earth's axis of rotation, and all latitudes have a 12-hour day and 12-hour night. On and near the Equator sunlight comes from almost directly above every day year-round, and thus the Equator has a rather stable daytime temperature the whole year.