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First ground observations of Saturn's spokes around 2009 equinox

Since 1980, only spacecraft or space telescope have been able to image spokes (intermittently appearing radial or elongated dark markings in Saturn’s B-ring) around the planet equinoxes. Amateur astronomers’ observations from Earth have been increasing in quality and coverage since a few years, leading around the 2009 equinox to the first ground observations, with a good coverage of Saturn’s rings. Combining these with amateur observations of white spots associated to storms (cf. [1]) can give some hints if the two kinds of events are related.