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recent publication from Jose Vaquero using AAVSO American Ra numbers

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HRHA
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recent publication from Jose Vaquero using AAVSO American Ra numbers

Attached is a recent publication from Jose Vaquero , et al.  using the American Ra number to compare to other sunspot indices and their active days.  

Rodney

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HNL
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sunspot classifications

Just to add to the current thoughts on sunspots. I was just at the current AAS meeting where Kristine Larsen had an excellent Poster paper on Elizabeth Brown who came up with her own way of recording sunspots and her own classification. Just thought I would mention it.

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