Northern Lights, Southampton

Northern lights shining over the Southampton Lighthouse in the evening of September 2, 2023, during a moderate (Kp 6) geomagnetic storm. The just-risen full moon illuminated the lighthouse, and turned the sky deep blue. The Kp index, which has a value from 0 to 9, is a measurement of geomagnetic activity. A Kp value of 5, indicating a minor geomagnetic storm, can bring on northern lights activity in southern Ontario.