Sunspots with the contours overlaid upon the image. Left and right side panels correspond to images recorded on Jan. 08 and Jan. 15, 1938. The image size is 1024 × 1024 pixels and each pixel corresponds to 2.5 arcsec.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
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