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Long-term variations in meridional motion of sunspot groups: comparison of DPD and SOON data
Published online by Cambridge University Press: 27 November 2018
Abstract
We have analyzed the Debrecen Photoheliographic Data (DPD) and the Solar Optical Observing Network (SOON) sunspot group data during the period 1977 – 2015 and find that during the maximum of solar cycle 23 there is a large difference in the mean meridional motion of sunspot groups determined from DPD and SOON data.
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- Copyright © International Astronomical Union 2018
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Formerly with Indian Institute of Astrophysics, Bengaluru-560 034.
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