The geomagnetic solar flare effect of 6 july 1968 and its implications

A study of the geomagnetic solar flare effect (SFE) of 6 July 1968 observed at five Indian magnetic observatories lying in the longitude range 72-80 deg E, revealed that this SFE is characterized by a decrease in the H-component at electrojet stations and an increase in the H-component at stations outside the electrojet. Examination of relevant ionogram and magnetogram data of Kodaikanal, a station under the electrojet, for this day indicated the existence of a counter-electrojet just prior to and after the occurence of SFE. The implication of these observations are discussed