Abstract
The equatorial boundary of proton aurorae during magnetic disturbances is estimated by observing the occurrence and intensity of the H α line. It is related to the intensity of the ring current ( DR) as measured by the magnetic index D st and to the intensity of the electrojet ( DP) as measured by the strength of the disturbance in the midnight sector. During the night the boundary of the aurora is found to shift towards the Equator by an amount that is related to the magnitude of D st . At all times of day the shift towards the Equator is closely related to the magnitude ( DP) of the polar magnetic disturbance.
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