NASA news: Agency shares this mesmerising photo of the Aurora Australis from space
The colourful NASA photo was snapped some 250 miles (402km) above Earth, as the space station passed over the Indian Ocean. You can see the wispy streaks of the Aurora Australis in the upper parts of the atmosphere. The aurora, also known as the Southern Lights in this part of the world, is glowing in various hues of green, blue and violet.
NASA said: “Like a wisp of electric green smoke, the Aurora Australis seemingly intersects with the Earth’s airglow as the International Space Station orbited above the Indian Ocean halfway between Australia and Antarctica.
“Ever-shifting displays of coloured ribbons, curtains, rays, and spots, auroras are most visible near the North (Aurora Borealis) and South (Aurora Australia) Poles as charged particles (ions) streaming from the Sun (the solar wind) interact with Earth’s magnetic field.”
Auroras are the result of charged particles from the Sun washing over the planet, exciting atoms of oxygen and nitrogen in the atmosphere.
The auroras typically appear in ring-shaped areas centred around the planet’s magnetic poles.
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What causes the Southern Lights and the Northern Lights?
The Southern and Northern Lights are caused by fast-moving, charged particles from the Sun colliding with atoms of gas in our atmosphere.
The charged particles are carried on solar winds towards the planet where they interact with the magnetosphere – a region of space around a planet where charged particles are affected by the body’s magnetic field.
The charged particles impart energy onto atoms of nitrogen and oxygen in the upper atmosphere.
Like a wisp of electric green smoke
When the atoms receive energy, they get excited and as they return to their normal state, they release the excess energy in the form of photons or light.
NASA said: “The light creates the aurora that we see. The most commonly observed colour of aurora is green.”
But the exact colour of the aurora will depend on the composition of the atmosphere.
According to the US space agency, oxygen typically emits greenish-yellow light or red light.
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Nitrogen, on the other hand, typically emits blue light.
Both gases also emit ultraviolet light, which is not visible to the naked eye.
But no two auroras are the same and the swirling streaks of gas are also characterised by their different and sometimes distinct shapes.
NASA said: “The shape of the aurora depends on where in the magnetosphere the electrons came from and on what caused them to precipitate into the atmosphere.
“Dramatically different auroral shapes can be seen in a single night.”
The best places to see the Northern Lights are in Alaska, Canada and Scandinavia.
The Aurora Borealis is best seen in the evening hours.
On very rare occasions, such as following a very powerful spike in solar activity, auroras can be seen as far south as Florida or Japan.
The Aurora Australis is best seen from Antarctica as well as parts of Australia and New Zealand.
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