A telescopic image of a rare blue flash above the setting sun, captured from La Palma in the Canary Islands. The sun's surface shows sunspot groups, and a subtle green rim is visible beneath the blue flash. This atmospheric phenomenon is caused by the refraction of sunlight.
Astronomy Picture from 09/01/2002
Blue Flash
Source: https://apod.nasa.gov/apod/ap020109.html
#GreenFlash #BlueFlash #SunsetPhenomena #AtmosphericOptics #Astrophotography #RareEvent #CanaryIslands #LaPalma #SunSpot #SolarRefraction
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