Correlation of magnetic, auroral, and ionospheric variations at Saskatoon: part 2

The relations between magnetic, auroral, and ionospheric observations are summarized with reference to the occurrence of positive and negative magnetic bays. Auroral light associated with positive bays occurs at a higher geomagnetic latitude than that associated with negative bays. The magnetic and auroral light variations are compared to Martyn's theory of the aurora. If the latter is accepted, the conclusion is reached (1) that most aurora is caused by positively charged particles, and (2) that the conditions described for the early phase actually exist throughout most of a disturbance.