太空物理学.pdf

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太空物理学.pdf

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太空物理学.pdf

 Aurora /wiki/Aurora_(astronomy) /211.jects/ Christina Shaw/Aurora Borealis index.htm Polar mesospheric cloud Altitude : 75 km to 85 km They are made of crystals of water ice. They are most commonly observed in the summer months at latitudes between 50° and 70° north and south of the equator. /wiki/Noctilucent_clouds Polar stratospheric cloud nacreous clouds or mother of pearl are clouds in the winter polar stratosphere at altitudes of 15 km – 25 km Altitude : 15 km to 25 km PSCs are classified into three types Ia, Ib and II according to their chemical composition. Type I clouds contain nitric acid and water. Type Ia clouds consist of crystals formed from nitric acid and water. Type Ib cloud droplets additionally contain sulfuric acid and are present in the form of supercooled ternary solution. Type II clouds consist of water ice only. /wiki/Polar_stratospheric_cloud