Abstract
Riometers at L-values of 4, 7 and 14 are used to elucidate the latitudinal movement of auroral absorption events, and the pattern so derived is combined with the results of a previous study on longitudinal movements. The resulting picture shows that in a median case the auroral disturbance begins near L = 7 at the midnight meridian, and spreads out with velocities of about 0.4 R e /min in the equatorial plane. It appears possible that the factor governing the time sequence of auroral precipitation is a hydromagnetic disturbance.
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