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Err... no, it doesn't say sunspot activity is increasing, rather it says that the magnetic fields within sunspots as demonstrated by spectral analysis appear to be weakening during solar cycle 23. Sunspots are a proxy for the strength of the magnetic field generated by the sun. Historically, when that field strength has decreased, earth got colder every time. For now, we're working on theories as to why and how much. During the Maunder Minimum (Google that), it was especially bad. We've only been keeping basic sunspot data for the last few hundred years and very detailed sunspot data for the last few decades.Pidgey
Err... no, it doesn't say sunspot activity is increasing, rather it says that the magnetic fields within sunspots as demonstrated by spectral analysis appear to be weakening during solar cycle 23. Sunspots are a proxy for the strength of the magnetic field generated by the sun. Historically, when that field strength has decreased, earth got colder every time. For now, we're working on theories as to why and how much. During the Maunder Minimum (Google that), it was especially bad. We've only been keeping basic sunspot data for the last few hundred years and very detailed sunspot data for the last few decades.
Pidgey
