Abstract:
A few characteristics of Pc 3-4 geomagnetic pulsation recorded at a station close to the equatorial
electrojet in the Indian region under varied ionospheric conditions are reported. The polarization
characteristics of these pulsations during counter electrojet condition are found to change in their
ellipticities and orientation axes. These are attributed to either height distortions of ionospheric electric
fields during the counter electrojet time or to changes of gyrotropic MHD waves that might be
endogenously generated by the turbulence of equatorial electrojet.
