caa a22 4500 445346280 CHVBK 20180317142829.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s11207-011-9761-2 doi (NATIONALLICENCE)springer-10.1007/s11207-011-9761-2 Coronal Mass Ejections as Expanding Force-Free Structures [Elektronische Daten] [M. Lyutikov, K. Gourgouliatos] We model solar coronal mass ejections (CMEs) as expanding force-free magnetic structures and find the self-similar dynamics of configurations with spatially constant α, where J=α B, in spherical and cylindrical geometries, expanding spheromaks and Lundquist fields, respectively. The field structures remain force-free, under the conventional non-relativistic assumption that the dynamical effects of the inductive electric fields can be neglected. While keeping the internal magnetic field structure of the stationary solutions, expansion leads to complicated internal velocities and rotation, caused by inductive electric fields. The structure depends only on overall radius R(t) and rate of expansion $\dot{R}(t)$ measured at a given moment, and thus is applicable to arbitrary expansion laws. In case of cylindrical Lundquist fields, magnetic flux conservation requires that both axial and radial expansion proceed with equal rates. In accordance with observations, the model predicts that the maximum magnetic field is reached before the spacecraft reaches the geometric center of a CME. Springer Science+Business Media B.V., 2011 Coronal mass ejections, interplanetary nationallicence Coronal mass ejections, theory nationallicence Magnetic fields, interplanetary nationallicence Lyutikov M. Department of Physics, Purdue University, 525 Northwestern Avenue, 47907-2036, West Lafayette, IN, USA aut Gourgouliatos K. Department of Physics, Purdue University, 525 Northwestern Avenue, 47907-2036, West Lafayette, IN, USA aut Solar Physics Springer Netherlands 270/2(2011-06-01), 537-549 0038-0938 270:2<537 2011 270 11207 https://doi.org/10.1007/s11207-011-9761-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-011-9761-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lyutikov M. Department of Physics, Purdue University, 525 Northwestern Avenue, 47907-2036, West Lafayette, IN, USA aut NATIONALLICENCE 700 1- Gourgouliatos K. Department of Physics, Purdue University, 525 Northwestern Avenue, 47907-2036, West Lafayette, IN, USA aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 270/2(2011-06-01), 537-549 0038-0938 270:2<537 2011 270 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer