2006/09/13 by J. Pelt, John Brooke, J. M. Brooke +2 · 23 citations
Earth and Planetary Sciences · Mathematics · Physics and Astronomy · #Astronomy #Astrophysics #Classical mechanics #Context (archaeology) #Differential rotation #Geodesy #Geology #Geometry #Geophysics and Gravity Measurements #Greenwich #Kinematics #Magnetic field #Mathematics #Physics #Rotation (mathematics) #Solar and Space Plasma Dynamics #Solar physics #Solar rotation #Stars #Stellar, planetary, and galactic studies #Sunspot #astro-ph
paper · pdf · doi:10.1051/0004-6361:20065399
published in Astronomy and Astrophysics 460(3), 875-885 (EDP Sciences) · 14 pages, 1 table, 21 figures, accepted in A&A
arxiv created 2006/09/13 · openalex publication_date 2006/09/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Context.It has recently been claimed that analysis of Greenwich sunspot data over 120 years reveals that sunspot activity clusters around two longitudes separated by 180° (“active longitudes”) with clearly defined differential rotation during activity cycles. In previous work we demonstrated that such effects can be observed in synthetic data without such features, as an artefact of the method of analysis.