Aurora colors in a bottle

davenn

Science Advisor
Gold Member
8,821
6,106
I would say that this looks more like Aurora Australis.
what makes you say that ? it clearly stated who took the photo and where it was taken

What is the reason for these changing colors?
the changing colours ... in the real aurora foto or in that experiment ?

In a real aurora, it is mainly the oxygen and nitrogen atoms getting ionised and creating their specific colours, mostly red and green
those colours then mix to produce other colours that are seen ... purples, yellow, sometimes blues


Dave
 
16
1
what makes you say that ? it clearly stated who took the photo and where it was taken



the changing colours ... in the real aurora foto or in that experiment ?

In a real aurora, it is mainly the oxygen and nitrogen atoms getting ionised and creating their specific colours, mostly red and green
those colours then mix to produce other colours that are seen ... purples, yellow, sometimes blues


Dave
Im trying to figure this out. I know that aurora appears in different colours as you mentioned. Ive seen aurora borealis many times, and it has always been green. Ive also seen pictures of aurora australis which has manly been purple. Why do they then refer to this experiment as the northern lights, when it is more typically the colours for the aurora australis? What exactly makes the difference for these lights beside that they appear on the northern and southern hemisphere? Is it a big (constant) difference in gas concentrations above each of the poles that effects the spectrum?
 

davenn

Science Advisor
Gold Member
8,821
6,106
Ive also seen pictures of aurora australis which has manly been purple.
that wouldn't be the norm, rather relatively rare. Only in the really intense displays would purples start to show .......
Aurora Australis is also primarily green and as the activity intensifies, the reds show, then the yellows and so on

here's are typical AA from my personal collection, This is from Dunedin, New Zealand

9811_au2.jpg


9811_au5.jpg


I do have some with colour trending towards purple, but these 2 pic's make my point :smile:

What exactly makes the difference for these lights beside that they appear on the northern and southern hemisphere? Is it a big (constant) difference in gas concentrations above each of the poles that effects the spectrum?
there is no real difference between the aurora seen at each pole

Dave
 

Baluncore

Science Advisor
6,856
2,101
Davenn is right.
Since the nitrogen and oxygen composition of the atmosphere is the same in both the northern and southern hemispheres, and the charged particles are exactly the same, one would expect the light to be identical.

To human eyes, the colour will always be a false colour since the three different broad-band colour sensors in our eyes are being stimulated by narrow band emissions.

The apparent colour differences will be due to the variable ability of the eye to see colour at low light levels, by the type of colour discrimination used in the camera that records the image, or by the screen used to regenerate the image, before it is first viewed by human eyes.
 

Want to reply to this thread?

"Aurora colors in a bottle" You must log in or register to reply here.

Related Threads for: Aurora colors in a bottle

  • Posted
Replies
1
Views
3K
  • Posted
Replies
4
Views
3K
  • Posted
Replies
2
Views
2K
Replies
1
Views
5K
Replies
11
Views
1K
  • Posted
Replies
2
Views
2K
Replies
4
Views
4K
Replies
15
Views
16K

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving

Hot Threads

Top