Photospheric Flux Cancellation and the Build-up of Sigmoidal Flux Ropes on the SunDOI: info:10.1088/0004-637X/759/2/105v. 759105
Savcheva, A. S., Green, L. M., van Ballegooijen, Adriaan A., and DeLuca, Edward E. 2012. "Photospheric Flux Cancellation and the Build-up of Sigmoidal Flux Ropes on the Sun." The Astrophysical Journal, 759 105. https://doi.org/10.1088/0004-637X/759/2/105.