1 / 24

Atmospheric Phenomena

Atmospheric Phenomena. Light, Color, and Observations. White and Colors. Rods and cones in human eye 0.4 µm – 0.7 µm visible light All wavelengths viewed at once = white Specific wavelengths = color (ROYGBIV). White Clouds and Scattered Light. Reflection and scattering (diffuse light)

shawnn
Download Presentation

Atmospheric Phenomena

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Atmospheric Phenomena Light, Color, and Observations

  2. White and Colors • Rods and cones in human eye • 0.4 µm – 0.7 µm visible light • All wavelengths viewed at once = white • Specific wavelengths = color (ROYGBIV)

  3. White Clouds and Scattered Light • Reflection and scattering (diffuse light) • Geometric scattering • White clouds scatter light • Black clouds have large cloud droplets which absorb light, rain likely

  4. Blue Skies and Hazy Days • Selective scattering • Rayleigh scattering • Blue haze (terepenes) • Crepuscular rays

  5. Red Suns and Blue Moons • A thick atmosphere selectively scatters all but red sunlight. • A low solar angle (sunrise or sunset) causes light to travel through a greater distance or thicker atmosphere. • Same process for a blue moon

  6. Twinkling, Twilight, and the Green Flash • Transmission, refraction • Light that travels from a less dense to a more dense medium loses speed and bends toward the normal, while light that enters a less dense medium increases speed and bends away from the normal. • Apparent position, scintillation, twilight, green flash

  7. The Mirage • An object appears to be displaced from true position. • Inferior: down to ground • Superior: up into air • Observation: Fata Morgana • Fairly uniform surface is transformed into one of vertical walls and columns with spires • Usually in polar regions with warm air over a cold surface

  8. Halos, Sundogs, and Sun Pillars • Halo and cirriform clouds : 22º and 46º, tangent arc • Dispersion • Sun dogs, parahelia • Sun pillars • Ice plates vs. ice columns

  9. Rainbows • Face falling rain with sun at back, water drops disperse light • Primary vs. secondary • Observation: Rainbow, no rain? • Other substance besides rain can refract or disperse light (such as ice crystals) and form rainbow.

  10. Coronas and Iridescence • Corona: bright ring of light created by diffraction • Iridescence: bright pastel colors of clouds created by diffraction • Observations: Gloried and Heiligenschein • Rings surrounding shadows

More Related