Aurora Borealis over Canada's Gulf of St. Lawrence | International Space Station

Aurora Borealis over Canada's Gulf of St. Lawrence | International Space Station

A red and green aurora borealis shimmers in this photograph from the International Space Station as it orbited 260 miles above Canada's Gulf of St. Lawrence.

The Gulf of St. Lawrence connects the Great Lakes to the Atlantic Ocean via the St. Lawrence River. This Gulf borders the shores of the provinces of Quebec, New Brunswick, Nova Scotia, Prince Edward Island, Newfoundland and Labrador, in Canada, plus the islands Saint-Pierre and Miquelon, possessions of France, in North America.

The aurora borealis, also known as the northern lights, occurs in an upper layer of Earth’s atmosphere called the ionosphere, but they typically originate with activity on the Sun. Occasionally, during explosions called coronal mass ejections, the Sun releases charged particles that speed across the solar system. 

Auroras are produced when the Earth's magnetosphere is sufficiently disturbed by the solar wind that the trajectories of charged particles in solar wind and magnetospheric plasma, mainly in the form of electrons and protons, precipitate them into the upper atmosphere (thermosphere/exosphere) due to Earth's magnetic field, where their energy is lost. The resulting ionization and excitation of atmospheric constituents emits light of varying color and complexity. [Wikipedia]

Solid Colored Aurora

Green is common at the upper latitudes, while red is rare. On the other hand, aurora viewed from lower latitudes tend to be red.

Element Emission Colors

Oxygen: The big player in the aurora is oxygen. Oxygen is responsible for the vivid green (wavelength of 557.7 nm) and also for a deep brownish-red (wavelength of 630.0 nm). Pure green and greenish-yellow aurorae result from the excitation of oxygen.

Nitrogen: Nitrogen emits blue (multiple wavelengths) and red light.

Other Gases: Other gases in the atmosphere become excited and emit light, although the wavelengths may be outside of the range of human vision or else too faint to see. Hydrogen and helium, for example, emit blue and purple. Although our eyes cannot see all of these colors, photographic film and digital cameras often record a broader range of hues.

Aurora Colors According to Altitude

Above 150 miles: red, oxygen

Up to 150 miles: green, oxygen

Above 60 miles: purple or violet, nitrogen

Up to 60 miles: blue, nitrogen

The Colors of the Aurora (National Park Service)

https://www.nps.gov/articles/-articles-aps-v8-i1-c9.htm

Expedition 72 Updates:
https://blogs.nasa.gov/spacestation/

Expedition 72 Crew
Station Commander: Suni Williams
Roscosmos (Russia) Flight Engineers: Alexey Ovchinin, Ivan Vagner, Aleksandr Gorbunov
NASA Flight Engineers: Butch Wilmore, Don Pettit, Nick Hague

An international partnership of space agencies provides and operates the elements of the International Space Station (ISS). The principals are the space agencies of the United States, Russia, Europe, Japan, and Canada.

Image Credit: NASA's Johnson Space Center (JSC)
Image Date: Jan. 4, 2025

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