Brilliant northern lights appeared over Oslo last night. The colorful display also reached Oppland, Telemark, Agder and Østfold regions. These areas are unusually far south for regular aurora sightings.
Clear, dark skies provide the best viewing conditions. Limited light pollution also helps visibility, according to meteorological officials.
What causes this natural phenomenon? Solar winds disturb Earth's magnetic field to create the lights. Scientists measure this geomagnetic activity using the KP-index scale.
Southern Norwegian residents rarely see such vivid displays. Last night's widespread visibility suggests unusually strong solar activity.
Weather services note light pollution remains the biggest obstacle for urban viewers. Rural areas consistently offer better aurora viewing opportunities.