Milky Way/Green Airglow Pano, Teton Valley

            This is a 10 field stitched panorama of the Milky Way Arch taken at Big Eddy along the Teton River near Driggs Idaho. I shot 8 different versions from this spot during the 12:30 to 2:30 AM hours on July 2018.  In the sky that night was a cool Green Airglow. Airglow turns up in time exposure photographs of the night sky as ghostly ripples of aurora-like light. Its similarity to the aurora is no coincidence. Both form at around the same altitude of  60-65 miles (100 km) and involve excitation of atoms and molecules, in particular oxygen. But different mechanisms tease them to glow.  

Auroras get their spark from high-speed electrons and protons in the solar wind that bombard oxygen and nitrogen atoms and molecules. As excited electrons within those atoms return to their rest states, they emit photons of green and red light that create shimmering, colorful curtains of northern lights.

Airglow’s subtle radiance arises from excitation of a different kind. Ultraviolet light from the daytime sun ionizes or knocks electrons off of oxygen and nitrogen atoms and molecules;  at night the electrons recombine with their host atoms, releasing energy as light of different colors including green, red, yellow and blue.  The brightest emission, the one responsible for creating the green streaks and bands visible from the ground and orbit, stems from excited oxygen atoms beaming light at 557.7 nanometers, smack in the middle of  the yellow-green parcel of spectrum. 

Nikon D850
Nikon 14-24mm f/2.8
Single RAW images
   

Taken on: July 3, 2018

Tags:

Milky Way

Green Airglow

Panorama

Big Eddy « less

Sets appears in: • Teton Valley • Explored

Camera: f/2.8, 30 sec, ISO 3200 (more info) (hide info)

Aperture:	f/2.8
Exposure Time:	30
ISO:	3200
Color Space:	Uncalibrated
Software:	Adobe Photoshop 24.0 (Macintosh)
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