TY - JOUR A1 - Vaquero T1 - Letter to the Editor
On the use of the sunspot number for the estimation of past solar and upper atmosphere conditions from historical and modern auroral observations JO - Ann. Geophys. J1 - ANGEO VL - 23 IS - 5 SP - 1959 EP - 1961 Y1 - 2005/07/28 PB - Copernicus Publications SN - 1432-0576 UR - https://angeo.copernicus.org/articles/23/1959/2005/ L1 - https://angeo.copernicus.org/articles/23/1959/2005/angeo-23-1959-2005.pdf DO - 10.5194/angeo-23-1959-2005 ER -