Abstract

The causes of the formation of neutral gas temperature and density equatorial minimums on the dayside, recently detected from satellite measurements, have been studied based on a global numerical model of the Earth’s upper atmosphere (UAM). The performed numerical experiments made it possible to conclude that these minimums are not related to the magnetospheric sources of energy and momentum and electric fields of the dynamo origin. It has been indicated that the absorbed solar ionizing radiation and rotation of the Earth are responsible for the formation of the neutral gas temperature and density equatorial minimums on the dayside.

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