{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/the-solar-benchmark-rotational-modulation-of","title":"The Solar Benchmark: Rotational Modulation of the Sun Reconstructed from Archival Sunspot Records","arxiv_id":"1901.04557","date":"2019-01-14","proceeding":null,"authors":["Brett M. Morris","James R. A. Davenport","Helen A. C. Giles","Leslie Hebb","Suzanne L. Hawley","Ruth Angus","Peter A. Gilman","Eric Agol"],"abstract":"We use archival daily spot coverage measurements from Howard et al. (1984) to study the rotational modulation of the Sun as though it were a distant star. A quasi-periodic Gaussian process measures the solar rotation period $P_\\mathrm{rot} = 26.3 \\pm 0.1$ days, and activity cycle period $P_\\mathrm{cyc} = 10.7 \\pm 0.3$ years. We attempt to search for evidence of differential rotation in variations of the apparent rotation period throughout the activity cycle and do not detect a clear signal of differential rotation, consistent with the null results of the hare-and-hounds exercise of Aigrain et al. (2015). The full reconstructed solar light curve is available online.","url_abs":"http://arxiv.org/abs/1901.04557v1","url_pdf":"http://arxiv.org/pdf/1901.04557v1.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"the-solar-benchmark-rotational-modulation-of","repo_url":"https://github.com/bmorris3/solarlightcurve","is_official":1,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}