Digitization team:
Alexei A. Pevtsov, Kseniya A. Tlatova, Alexander A. Pevtsov, Elina Heikkinen, Ilpo Virtanen, Nina V. Karachik, Luca Bertello, Andrey G. Tlatov, Roger Ulrich, Kalevi Mursula

Data type: dataset

Publication date: 2 July 2019

DOI: 10.25668/bkt9-4d24

Abstract:
This database contains information extracted from hand-drawings of sunspot magnetic field observations from Mount Wilson Observatory for 1917-2015 period. Systematic observations of magnetic field strength and polarity in sunspots began at Mount Wilson Observatory (MWO), USA in early 1917. Except for a few brief interruptions, this historical dataset continues till present. A detailed description of MWO synoptic program of magnetic field observations and the digitization of this dataset can be found at: Pevtsov, A.A., Tlatova, K.A., Pevtsov, A.A., Heikkinen, E., Virtanen, I. I.,  Karachik, N.V., Bertello, L., Tlatov, A.G., Ulrich, R., and Mursula, K: 2019, “Reconstructing solar magnetic fields from historical observations. V. Sunspot magnetic field measurements at Mount Wilson Observatory“, Astron. Astrophys., 628, A103, DOI: 10.1051/0004-6361/201834985

Images of scanned drawings are available via ftp://howard.astro.ucla.edu/pub/obs/drawings

Recommended citation:
Pevtsov, A.A., Tlatova, K.A., Pevtsov, A.A., Heikkinen, E., Virtanen, I., Karachik, N.V., Bertello, L., Tlatov, A.G., Ulrich, R., Mursula, K., 2019, “Sunspot magnetic field and polarity measurements at Mount Wilson Observatory 1917 – 2016”, DOI: 10.25668/bkt9-4d24

This work is licensed under a Creative Commons Attribution 4.0 License.

Download data: historicalsolardata.org/MWO_Sunspots/ (MySQL query)