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- W949497 abstract "Waldmeier [1971] found a very tight relationship between the F10.7 solar radio flux and the sunspot number and suggested using the flux for an objective calibration of the sunspot number. He suggested that if this relationship changed later on, the sunspot number should be recalibrated, assuming that the calibration must have drifted with time. I repeat his analysis using data up to the present and it is, indeed, clear that the relationship has changed significantly. This could be due to a drift of the calibration or to a secular change in the visibility of sunspots, or both." @default.
- W949497 created "2016-06-24" @default.
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- W949497 date "2010-12-01" @default.
- W949497 modified "2023-09-26" @default.
- W949497 title "Objective Calibration of Sunspot Numbers" @default.
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