PES 105 Earth_ Atmosphere, Magnetic Field

PES 105 Earth_ Atmosphere, Magnetic Field - 1/15/12 PES 105...

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1/15/12 PES 105 Earth: Atmosphere, Magnetic Field 1/7 www.uccs.edu/±tchriste/courses/PES105/105lectures/105lecearth2.html PES 105 Fall 2001 Previous Lecture General Astronom\ I Next Lecture Lecture Notes: Earth: Atmosphere, Magnetic Field text: Chapter 5, Sections 5.5 - 5.6 (Chapter 4 in 2nd edition) Atmosphere From space Earth looks blue: from : 1. scattered light in atmosphere 2. reflected light from oceans Light scattering: molecules and dust in atmosphere scatter light which colors scatter best depends on particle si]e in our atmosphere, si]e is right to scatter blue best
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1/15/12 PES 105 Earth: Atmosphere, Magnetic Field 2/7 www.uccs.edu/±tchriste/courses/PES105/105lectures/105lecearth2.html Vk\ iV blXe VeWWing VXn lookV Ued AWmoVpheUe CompoViWion 78 % NiWUogen (N 2 ) fUom deca\ of biological VWXff and Yolcanic eUXpWionV 21 % o[\gen (O 2 ) fUom phoWoV\nWheViV in planWV (CO 2 -> O 2 ) 1 % eYeU\Whing elVe if no life on EaUWh => YeU\ diffeUenW aWmoVpheUe AncienW aWmoVpheUe had moUe h\dUogen (Zhich eVcaped), meWhane and amonia
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PES 105 Earth_ Atmosphere, Magnetic Field - 1/15/12 PES 105...

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