Sunspot Daily Dataset (without Missing Values)
Rakshitha Godahewa, Christoph Bergmeir, Geoffrey I. Webb, Rob J. Hyndman, Pablo Montero‐Manso · Zenodo (CERN European Organization for Nuclear Research) · 2020
This dataset contains a single very long daily time series of sunspot numbers from 1818-01-08 to 2020-05-31. The original dataset contains missing values and they were replaced by carrying forward the corresponding last observations (LOCF method).