THE OBSERVATIONS ON THE IONOSPHERIC HALL CONDUCTIVITY IN AURORAL ZONE AND ITS BEHAVIOUR UNDER E REGION ELECTRON HEATING

The data from the EISCAT radar and corresponding ground-based geomagnetic observations are used for deriving the ionospheric Hall conductivity.There are two calculating methods employed,one is the direct estimate from ionospheric parameters,the other is indirect estimate from ground geomagnetic field.The results show that when there appears the electrons heated by the Eregion plasma unstable waves,the Hall conductivity increases conspicuously.