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"The gigantic solar storms of November 2003 severely depleted the ozone layer above the Arctic for as long as eight months, suggest newly released satellite observations. Ozone levels had reduced to just 40% of normal spring levels in 2004.
: 'We have never seen ozone close to this level in the northern hemisphere,' says Cora Randall, a researcher with the Laboratory for Atmospheric and Space Physics at the University of Colorado at Boulder, US, and one of the study team."