Aurora Australis, the southern polar lights - 13 fotos

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Aurora Borealis southern counterpart, the aurora australis or the southern polar lights, has similar properties, but is only visible from high southern latitudes in Antarctica, South America, or Australasia. Australis is the Latin word for “of the South.”

The light show comes to us courtesy of our Sun. Electrically charged particles produced on the Sun are ejected in all directions and a great amount of them head toward Earth. As these particles (called solar wind) encounter the Earth’s outer regions, the magnetic field of the Earth begins to interact with the particles.

What results is a change in energy and direction of the particles: they head along magnetic field lines toward the poles of Earth. Just like a bar magnet has its field lines returning at the opposite ends so the Earth’s magnetic lines come together around the poles. This is why the aurora borealis is brightest and most easily seen in the northern regions of our planet.

Most auroras are green and red emissions from atomic oxygen. Molecular nitrogen and nitrogen ions produce some low level red (pink) and very high blue/violet auroras. The light blue and green colors are produced by ionic nitrogen and the neutral helium gives off the purple colour whereas neon is responsible for the rare orange flares with the rippled edges. Different gasses interacting with the upper atmosphere will produce different colors, caused by the different compounds of oxygen and nitrogen. The level of solar wind activity from the Sun can also influence the color and intensity of the auroras.

Aurora Australis at the South Pole (2008)

1 Aurora Australis at the South Pole (2008) Credit: Euclid vanderKroew #
Aurora Australis Red.

2 Aurora Australis Red. Credit: lrargerich #
July 2005, a full moon and 25 second exposure allowed sufficient light into this photo taken at Amundsen-Scott South Pole Station (90°0′0″S, 139°16′0″W) during the long Antarctic night.

3 July 2005, a full moon and 25 second exposure allowed sufficient light into this photo taken at Amundsen-Scott South Pole Station (90°0′0″S, 139°16′0″W) during the long Antarctic night. Credit: U.S. National Science Foundation (Wikipedia) /Chris Danals #
Aurora Australis.

4 Aurora Australis. Credit: sandwichgirl #
Aurora Australis - Antarctica 23.

5 Aurora Australis - Antarctica 23. Credit: Chantal Steyn #
Aurora Australis - Antarctica 29.

6 Aurora Australis - Antarctica 29. Credit: Chantal Steyn #
Aurora Australis - Antarctica 28.

7 Aurora Australis - Antarctica 28. Credit: Chantal Steyn #
Aurora Australis - Antarctica 31.

8 Aurora Australis - Antarctica 31. Credit: Chantal Steyn #
Aurora Australis - Antarctica 32.

9 Aurora Australis - Antarctica 32. Credit: Chantal Steyn #
Aurora Australis.

10 Aurora Australis. Credit: vilebender #
Aurora australis in Antarctica, 2006-04-22.

11 Aurora australis in Antarctica, 2006-04-22. Credit: Samuel Blanc #
Antarctica. Auroras, 15jun07.

12 Antarctica. Auroras, 15jun07. Credit: sandwichgirl #
Aurora australis: nature's laser light show. 
Taken from the trailhead to castle rock near arrival heights, mcmurdo station antarctica. Winter 2007 (note: winter in south hemisphere = summer in north).

13 Aurora australis: nature's laser light show. Taken from the trailhead to castle rock near arrival heights, mcmurdo station antarctica. Winter 2007 (note: winter in south hemisphere = summer in north). Credit: sandwichgirl #
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Comment (1)

  1. Celebes wrote::

    Superb*****

    Friday, October 2, 2009 at 9:20 pm #

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    [...] Aurora australis, the southern polar lights Aurora borealis, the northern polar lights VN:F [1.7.0_948]please wait…Rating: 5.0/5 (5 votes cast) 1 Credit: orvaratli # 2 Credit: orvaratli # 3 Credit: orvaratli # 4 Credit: orvaratli # 5 Credit: alf07 °,° # 6 Credit: fluonebula # 7 Credit: well_lucio # 8 Credit: orvaratli # 9 Credit: omarrun # 10 Credit: Pétur Gauti # 11 Credit: alf07 °,° # 12 Credit: nick_russill # 13 Credit: -RobW- # 14 Credit: well_lucio # var linkwithin_site_id = 34662; (function () { var elem = document.createElement('script'); elem.type = 'text/javascript'; elem.src = 'http://www.linkwithin.com/widget.js?rand=' + Math.random(); document.getElementsByTagName('head')[0].appendChild(elem); })(); Post a comment | Trackback URI [...]

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