Auroral Corona over Norway . ... Credit Copyright: Harald Albrigtsen Explanation: Higher than the highest mountain lies the realm of the aurora. Auroras rarely reach below 60 kilometers, and can range up to 1000 kilometers. ... Somewhat uncommon, an auroral corona appears as a center point for a surrounding display and may occur when an aurora develops directly overhead, or when auroral rays are pointed nearly toward the observer. ... NASA Web Site Statements, Warnings, and Disclaimers . ...