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In this short contribution the use of different sunspot numbers for theestimation of past solar and upper atmosphere conditions from historical andmodern auroral observations realised by Schröder et al. (2004) isanalysed. Moreover, some comments are made on the relationships between meanannual visual observations of the auroras at middle latitudes of Europe andthe mean annual sunspot number during 1780–1829.  <b>Keywords.</b> Atmospheric composition and structure (Airglowand aurora) – Magnetospheric physics (Auroral phenomena,solar wind-magnetosphere interactions) – Historyof geophysics (Solar-planetary relationship

annales geophysicae

&amp;lt;i&amp;gt;Letter to the Editor&amp;lt;/i&amp;gt;On the use of the sunspot number for the estimation of past solar and upper atmosphere conditions from historical and modern auroral observations