Does sunspot number calibration by the ‘ ‘ magnetic needle ’ ’ make sense ?

Abstract

(so-called rY values). The suggested ‘‘correction’’ method makes an a priori detrending of the rY series and then extends the linear regression between rY and sunspot numbers established for the last 25 years to earlier times. The suggested ‘‘correction’’ of sunspot numbers by roughly 30% goes far beyond the traditional estimates of observational… (More)

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