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Strong Temporal Variation Over One Saturnian Year: From Voyager to Cassini

West, Robert A.; Baines, Kevin H.; Nixon, Conor A. +14 more

Here we report the combined spacecraft observations of Saturn acquired over one Saturnian year (~29.5 Earth years), from the Voyager encounters (1980-81) to the new Cassini reconnaissance (2009-10). The combined observations reveal a strong temporal increase of tropic temperature (~10 Kelvins) around the tropopause of Saturn (i.e., 50 mbar), which…