Mostly it will appear green although other colors ranging to red will be occasionally observed.
Green - at lower altitudes. Fairly high concentration of atomic oxygen and higher eye sensitivity in green make green auroras the most common.
Blue and purple emissions - typically at the lower edges of the "curtains", show up at the highest levels of solar activity
Red - at the highest altitudes. Low concentration of atoms and lower sensitivity of eyes at this wavelength make this color visible only under more intense solar activity
Yellow and pink are are possible as a mix of red and green or blue.
Note: Other shades of red as well as orange may be seen on rare occasions; yellow-green is moderately common. As red, green, and blue are the primary colors of additive synthesis of colors, in theory practically any color might be possible
I saw the aurora borealis above me, it was beautiful it's colors so bright.
Probably all of them. It is a spectacle to behold.
The Aurora Australis is a dazzling display of colors in the night sky due to solar flares. It appears in the Southern Hemisphere. Its Northern Hemisphere counterpart is the Aurora Borealis.
Aurora makes coated strings in many colors.
The aurora can be blue, green, red - many colors!
The Northern and Southern Lights (Aurora Borealis and Aurora Australis).
Solar winds find a small break in the magnetic field.The aurora is actually a radioactive burst and the colors you see are due to the magnetic fields
Green is the commonest color in the Aurora Borealis as green is produced when charged particles from the sun collide with atoms of oxygen at a high level. The Aurora over Greenland would sometimes show colors of blue and red, though probably not as often.
Green and pink are most common, but purple isn't all that unusual. The colors of the aurora are determined by what elements are ionized by the solar wind in the ionosphere.
I wrote this alt and I've separated the questions so I'd like to trash it. Thanks.
The Aurora Australis is capable of creating virually every colour in the sky in Antartica.
Aurora is described as aurora borealis in the northern hemisphere. In southern hemisphere aurora is describes as aurora australis .