Hemispheric Sunspot Numbers from the Astronomical Observatory of the University of Valencia (1940 – 1956)

Abstract In this work, we present hemispheric sunspot number counts made in the Astronomical Observatory of University Valencia for period 1940 – 1956. We found these data a secondary source (the bulletins Madrid Observatory). digitized and group recorded by observers. Unfortunately, positions or areas were not published source. A machine-readable version dataset is available as supplementary material. compare series with others from other observatories, such Observatory, finding similar behaviors. also computed asymmetry index data. that northern hemisphere was predominant our study (declining phase Solar Cycle 17, 18, rising 19), southern leading. These results agree those obtained previous studies. Therefore, records are one more piece information to know behavior hemispheres during 20th century.