Sunspot magnetic fields in solar cycle 24 on measurements at Crimea and Mount Wilson
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Abstract
We present a comparative analysis of 6235 measurements of maximum magnetic fields of the same sunspots obtained at the Crimean Astrophysical Observatory (CrAO) and the Mount Wilson Observatory (MWO) from 2009 to 2019, with the intensity B exceeding 1.5 kGs on CrAO data. It has been established that the average values of the magnetic fields derived at CrAO and MWO are 2053 and 1914 Gs, respectively. The correlation coefficient between the magnetic field measurements at different observatories is 0.63±0.01, and it decreases with increasing B. The difference between the average values of magnetic fields exceeds 500 Gs for sunspots with B ≥ 2.5 kGs. The maximum values of sunspot magnetic fields for the period under consideration according to CrAO and MWO data are 4.6 and 2.7 kGs, respectively. Possible reasons for data discrepancies are discussed.
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