Summary
Earth’s upper atmosphere emanates a faint luminescence known as airglow. This non-thermal radiation occurs at altitudes from about 50 to 300 km and is initiated by solar radiation absorbed by atmospheric constituents. Light emission observed during the day is called dayglow. A plethora of photochemical processes and excitation pathways persist through the night and collectively result in emission called nightglow. The OH Meinel band emission, named after American astronomer Aden B. Meinel, is a prominent spectral feature of the nightglow near 88 km. It originates from vibrationally excited hyd
