2026-10-12T01:31:57Z https://www.scidb.cn/oai

10.57760/sciencedb.013da 2026-09-28T17:22:07Z

2026-09-28 Published June 25, 2026 | Version v0.2 Journal article Open The data for Chinese Sunspot Drawings and Their Digitization – (VIII) Release of a Machine Readable Parameters Catalog doi:10.57760/sciencedb.013da en This dataset contains the machine-readable digital catalog of historical sunspot drawing observations from six Chinese observatories. It includes sunspot numbers, sunspot group numbers, sunspot area measurements, and other related parameters. For a complete description of all parameters, data schema, column definitions, units, and missing value codes, please refer to the README file accompanying this dataset. Observatories included: Yunnan Observatory (YNO, 1957-2015), Purple Mountain Observatory (PMO, 1954-2011), Qingdao Guang Xiang Observatory (QDO, 1925-2011), Sheshan Observatory (SSO, 1952-1964), Beijing Planetarium (BJP, 1979-1982, 1989-1999). This dataset accompanies the manuscript "Chinese Sunspot Drawings and Their Digitization – (VIII) Release of a Machine Readable Parameters Catalog" (ApJS). Sunspots; solar ; solar cycle Suo Liu Guanghua Lin PUBLIC https://creativecommons.org/publicdomain/zero/1.0/ dataset Science Data Bank