Citations:intraspine


 * 2011 Basilio Ruiz Cobo, Klaus G. Puschmann, "Twist, Writhe & Helicity in the inner penumbra of a sunspot" arXiv
 * The writhe per unit length of the intraspines diminishes with increasing length of the tube axes. Thus, the axes of tubes related to intraspines are less wrung when the tubes are more horizontal. As the writhe of the spines is very small, we can conclude that the writhe reaches only significant values when the tube includes the border of an intraspine.