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Light and Atmospheres

Explore the complex interactions of light and gases in Earth's atmosphere. Discover how greenhouse gases absorb infrared light, the scattering of visible wavelengths based on their properties, and the crucial role of ozone (O3) in absorbing harmful ultraviolet light. Learn how chemical balances are disrupted by chlorofluorocarbons (CFCs) and how X-rays ionize atmospheric layers. Understand the necessity of space telescopes for clearer observations and the atmospheric effects on ground-based observations.

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Light and Atmospheres

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Presentation Transcript

  1. Light and Atmospheres • Greenhouse gases absorb infrared light • Scattering of visible wavelengths depends on wavelength • Molecular dissociation by ultraviolet light • Ionization by X-rays

  2. Atmospheric Layers

  3. Greenhouse Effect

  4. Blue Sky: Scattered Light

  5. UV and X-ray Light • Ozone (O3) in stratosphere of Earth absorbs ultraviolet light. • Chemical balance between O3 and O2 • Chlorofluorocarbons (CFCs) destroy ozone • X-rays ionize the upper layers of the atmosphere (ionosphere) • Charged particles reflect low frequency radio waves (e.g., AM radio)

  6. Atmospheric Windows • Certain wavelengths require orbiting telescopes • Radio and visible light can be done from ground

  7. Seeing: Atmospheric Effect

  8. Why Put a Telescope in Orbit? • The only reason to put a telescope in space is to eliminate atmosphere! • a) ground-based b) damaged Hubblec) enhanced image d) repaired Hubble

  9. Mauna Kea

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