Abstract
Theoretical calculations of the electrostatic field in the ionosphere are presented for different seasons and longitude zones. The corresponding current systems have been shown earlier to give good agreement with the geomagnetic Sq variations. The question of whether the electrostatic field is generated by winds in the ‘dynamo region’ or by other processes higher in the magnetosphere is evaluated in the light of recent observations. Several details of the electrostatic field variation, such as an increase near sunset, are noted.
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