Magnetic Helicity, Tilt, and Twist Pevtsov, Alexei A. ; Berger, Mitchell A. ; Nindos, Alexander ; Norton, Aimee A. ; van Driel-Gesztelyi, Lidia Abstract Publication: The Solar Activity Cycle Pub Date: 2015 DOI: 10.1007/978-1-4939-2584-1_10 Bibcode: 2015sac..book..285P Keywords: Physics