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atmosphere(88)
density(31)
altitude(28)
ions(25)
magnetic field(25)
solar wind(23)
carbon(18)
carbon dioxide(17)
oxygen(11)
ultraviolet radiation(11)
radar(10)
storms(9)
atmospheric temperature(8)
clouds(8)
electric field(8)
minerals(8)
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corona(7)
solar radiation(7)
velocity(7)
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