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- PLUME
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- Polar plume. Plumes are best visible during activity minimum, when there are pronounced coronal holes.
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- Polar plumes of the Sun's south pole.
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- Top: MDI magnetogram.
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- Middle: The million K corona as seen in the Fe IX/X emission line at 171≈.
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- Bottom: The upper chromosphere as seen in the He II emission line at 304 ≈. The two lower images by EIT.