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. 2015 Sep 10;5:13977. doi: 10.1038/srep13977

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The upper panel (a) shows data taken on a clear day (23 June 2013) and the lower panel (b) does the same for a cloudy day (20 June 2013). The horizontal axis indicates time in Japanese Standard Time (Universal Time + 9 hr). The violet line (left axis) plots NUV flux density and the yellow line (right axis) does total solar flux density. The data were obtained in one-minute intervals.