from Andrés Muñoz-Jaramillo

The number of polar faculae is a very good proxy for the average magnetic field and total signed polar flux present inside the polar crowns.

Neil Sheeley, Jr. created a record of polar faculae counts, at a cadence of one measurement per year (starting in 1906 and ending in 2007), during four separate data reduction campaigns. These data have been now consolidated, cross-callibrated, and calibrated to magnetic measurements taken by the Wilcox Solar Observatory and SOHO/MDI polar flux.

The calibrated data, the original data, and all intermediate calibration steps are available for download at solardynamo.org/data.html

For any questions, suggestions, or concerns, please contact Andrés Muñoz-Jaramillo (amunoz@gsu.edu)