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'The Aurora Tree', a stunning pic by Alyn Wallace, shows an incredible visual coincidence between the bare branches of a foreground tree and the brilliant glow of a far- away aurora.
The pic was taken in Iceland in March 2017.
Image source and info: https://apod.nasa.gov/apod/ap210228.html
'The Aurora Tree', a stunning pic by Alyn Wallace, shows an incredible visual coincidence between the bare branches of a foreground tree and the brilliant glow of a far- away aurora.
The pic was taken in Iceland in March 2017.
Image source and info: https://apod.nasa.gov/apod/ap210228.html
Comments
The auroras' green component is due to solar particles reacting with Oxygen atoms about 150 km above Earth’s surface.
The red component occurs at higher altitudes, 150 km to 500 km, because temperature and density of the atmosphere favor atomic transitions emitting red photons.