DISTURBANCE DAILY VARIATION OF EQUATORIAL ELECTROJET CURRENT

Combining the long series of the simultaneous data of the horizontal c omponent of the geomagnetic field (H) at the equatorial station, Triva ndrum and at the low-latitude station, it has been shown for the first time that the disturbance daily variation of the equatorial electroje t current has a very clear anti-so shape with a minimum around noon, D isturbance atmospheric dynamo seems to be a plausible explanation, but some systematic magnetospheric processes related to local solar time may also be effective sources for the phenomenon.