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Cyclical variation of the quiet corona and coronal holes |
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| Authors: | Takashi Sakurai |
| Institution: | (1) National Astronomical Observatory, Japan |
| Abstract: | Recent advances in the understanding of the quiet corona and coronal holes are reviewed. The review is based on long-term accumulation of data from eclipse observations, coronagraph observations, helium 10830 å spectroheliograms, and X-ray observations. |
| Keywords: | Coronagraphs solar activity cycle solar corona total eclipses X-ray observations |
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