The Solar Rotation in the Period 1853 – 1870 from the Sunspot Catalogues of Carrington, Peters, and de la Rue
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Abstract
R.C. Carrington, C.H.F. Peters, and W. de la Rue observed the sunspots in the second half of the nineteenth century, determining their heliographic positions between 1853 and 1870, before the solar program of the Royal Greenwich Observatory was established. The large tables of sunspot positions included in the catalogues published by these observers have recently been converted into a machine-readable format. The present work analyses these data by calculating the sunspot group velocities for each observer. The results are then fitted with a differential-rotation law to compare the data of the three observers with each other and with the results published by others. Finally, we study the possible relationship between the sunspot-group areas as determined by de la Rue and the corresponding sunspot-group velocities.
Keywords
Rotation Solar cycle, observations Sunspots, velocityNotes
Acknowledgements
Ricard Casas acknowledges financial support received from the Spanish Ministerio de Ciencia e Innovación (MICINN), project AYA2012-39620, Consolider-Ingenio CSD2007-00060, and research project 2009SGR1398 from the Generalitat de Catalunya. José M. Vaquero acknowledges financial support from the Junta de Extremadura (Research Group Grant No. GR10131), from the Ministerio de Economia y Competitividad of the Spanish Government (AYA2011-25945), and from the COST Action ES1005 TOSCA .
Disclosure of Potential Conflicts of Interest
The authors declare that they have no conflicts of interest.
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