Aurora
description
Transcript of Aurora
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AuroraProfessional Skills, Tutorial Group J
Brian Yu, Daniel Russell, Si WuLiuba Dvinskikh, Mattia Gaggi
Imperial College London5th November, 2013
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Timeline
The Aurora (1991)
Earth’s Magnetic
Field (1716)
11-Year Sunspot
Cycle (1844)
Solar Activity-Aurora Relation
(1896)
Height of the Aurora
Measurement (1911)
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Nuclear FusionCoulomb
Repulsion
Strong Nuclear
Force
• E = mc²• Yield of KE
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Stellar Magnetic Field
Formation of plasma Convection Differential
rotation Solar activity
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CME and Solar Wind
Solar Flares Coronal Mass Ejection Geomagnetic Storm
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Electromagnetic Interaction
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Atomic Excitation
Plasma collides with air particles
Air particles absorb potential
energy
Air particle re-radiates
energyAurora
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Colour of Aurora
• Collisions mainly caused by electrons• Proton (rare!) larger mass more energetic
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Altitude of Aurora
• Lower bound at 100km• Upper bound at ~1000km• Red emission from the
oxygen is always above the green emission from the oxygen
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Conclusion!