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I would like to plot a butterfly diagram. I've been looking through the SOHO archive for a table that would indicate the date and position of each sunspot, but to no avail. The closest I got was to use the archived images to create the table myself, but that would be extremely fastidious.

Is there a place where I might find this kind of data?

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The National Solar Observatory historical archive lists at least one source of sunspot data. Under 'Sacramento Peak Telescope'->'Evans Solar Facility' there is a Dropbox link to Sunspot numbers data which seems to have spot numbers against time in ASCII format; this may be a suitable resource to get you going.

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    $\begingroup$ The sunspot number isn't exactly what I'm going for. I would like to have the latitude of the sunspots. $\endgroup$
    – usernumber
    Commented Mar 2, 2020 at 8:25
  • $\begingroup$ Makes sense, I will need to do some further digging. I found the quality of data archiving there surprisingly poor, hopefully there is a dataset out there to be found without having to reanalyze all the full-disk solar images. $\endgroup$ Commented Mar 2, 2020 at 16:58

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