Answer:
Most auroras occur in the E-layer of the ionosphere
Step-by-step explanation:
The E-layer of the ionosphere is located 90 km to 150 km (60 mi to 90 mi) above the earth’s surface. However, auroras also occur in the F-layer of the ionosphere, which is located above the E-layer that is located between 150 km and 500 km (90 mi to 300 mi) altitude