Calibrating 100 Years of Polar Faculae Measurements: Implications for the Evolution of the Heliospheric Magnetic FieldDOI: info:10.1088/0004637X/753/2/146v. 753146
Muñoz-Jaramillo, Andrés, Sheeley, Neil R., Zhang, Jie, and DeLuca, Edward E. 2012. "Calibrating 100 Years of Polar Faculae Measurements: Implications for the Evolution of the Heliospheric Magnetic Field." The Astrophysical Journal, 753 146. https://doi.org/10.1088/0004637X/753/2/146.