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5 VÄGA HEA
Punktid

Norther
n Lights
Kaisa  Kask
Introduction
1. How and where  Northern  Lights appear?
2. How the Northern Lights got their  colors ?
3. Do the Northern Lights emit  sound ?
How and where Northern Lights appear?
• Charged particles collide with 
molecules
• Generate a  glow
• The strongest auroras are  quite  
bright
• The aurora occurs  above :
altitudes of 80 km
infrequently above 500 km
normal altitudes 110 and 200 
km
How the Lights got their colors?
• Every gas creates a  different  
color
• neon lights:
helium – pink /white
neon - red/orange
argon - lavender
krypton - gray/ green
The colors of auroras
•  Determined  by gases in the Earth’s 
atmosphere
•  Solar  particles collide with different 
gases 
•  Oxygen  (300km) – a  rare  red aurora
• Oxygen (100-300km) – yellow-to-green 
aurora
• Nitrogen moleculs – a red light 
• Hydrogen & helium –  blue  and  purple  
Do the Northern Lights emit 
sound?
•  Subject  of discussion
•  Proven  that people can  hear  natural auroral sounds
• Energetic particles produce strange „ clapping “ noise
• Do not  occur  every northern lights outburst
•  Usually   brief  and faint
•  https://www.youtube.com/watch?v=eHvdZdsIZxg 
Conclusion
• How  the Northern Lights appear
• Why  the Northern Lights have 
different colors
• About the sound they emit
Thank you for your 
attention!
sources
• http://
www.athropolis.com/ arctic -facts/ fact -
nlights-color.htm
• http://
www. space .com/16498-northern-lights
-clapping-sound-explained.html
 
• http://
www.adn.com/article/confirmed-auror
a-borealis- makes -sounds
 
•  https://www.youtube.com/watch?v =
eHvdZdsIZxg
 

Document Outline

  • Slide 1
  • Introduction
  • How and where Northern Lights appear?
  • Slide 4
  • How the Lights got their colors?
  • Slide 6
  • The colors of auroras
  • Slide 8
  • Slide 9
  • Slide 10
  • Slide 11
  • Do the Northern Lights emit sound?
  • Conclusion
  • Thank you for your attention!
  • sources
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