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Atmospheric Optics

Atmospheric Optics. GEOG 1112- Lecture 17. Atmospheric Optics. Light. Reflection Refraction Amount of bending depends on material, wavelength, and incident angle Dispersion Colors separate as they are bent by refraction Scattering. Blue Sky. Scattering by air molecules

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Atmospheric Optics

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  1. Atmospheric Optics GEOG 1112- Lecture 17

  2. Atmospheric Optics

  3. Light • Reflection • Refraction • Amount of bending depends on material, wavelength, and incident angle • Dispersion • Colors separate as they are bent by refraction • Scattering

  4. Blue Sky • Scattering by air molecules • Rayleigh scattering (air molecules) • Mie scattering (dust) • Selective to shortwave (blue) light

  5. Setting Sun • Sun sets before you see it set • Density of atmosphere bends light • shorter wavelengths (blue/green) undergo less refraction • longer wavelengths (red/orange) undergo more refraction

  6. Green Flash

  7. Mirage • Refraction of light as it passes through air of different temperatures • Vertical temperature gradient • Hot air and cold air layers • Distant objects appear shorter

  8. Inferior Mirage • Ground warmer than aloft

  9. Superior Mirage • Ground cooler than aloft

  10. Halos

  11. Glory • Ice clouds

  12. Rainbow • Reflection of of water droplets

  13. Aurora Borealis & Aurora Australis • Solar flares • Solar wind • Poles collect particles • Particles collide with atmosphere

  14. Star Twinkle • Refraction

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