抄録
The ‘separation’ procedure described in Part I has been used to divide the Sq current system into three subsystems. The first of these is associated with seasonal variations and has current strength of about 100kA. Its origin appears to be semidiurnal winds.
The second subsystem is called the ‘Fuquene’ system and has a strength about 150kA (±50%). It appears to be due to magnetospheric sources and, at least at the equator, may not flow at ionospheric heights.
The third subsystem is called the ‘constant’ and has a strength of about 220kA (±50%). It is possibly due to direct ionospheric heating.
