CORRESPONDENCE

Fernando Domínguez-Castro; José M. Vaquero

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CORRESPONDENCE

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The recovery of old sunspot observations is essential to reconstruct solar activity in the past and understand the long-term solar variability. Some works have been focussed on this task, collecting large amounts of daily counts of sunspot group numbers. The number of days with records per year in these collections is very variable from 1610 to the present. There is, at least, one observation per day from 1848 to present, but there is a low frequency of observations in some years of the 17th and 18th Centuries. In particular, the interval 1777-1795 is one of the periods with scarcely any observations in the database4.

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来源
《Observatory》 |2017年第1260期|共2页
作者
Fernando Domínguez-Castro; José M. Vaquero;
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作者单位

Instituto Pirenaico de Ecologia Consejo Superior de Investigaciones Cientificas (IPE-CSIC) Avda. Montanana 1005. E-50059 Zaragoza Spain;

Departamento de Física Centro Universitario de Mérida Universidad de Extremadura Avda. Santa Teresa de Jornet 38 E-06800 Mérida Badajoz Spain;

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原文格式 PDF
正文语种 eng
中图分类天文学;
关键词
sunspot; activity; collections;

机译：太阳黑子;活动;集合;

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