Early evolution of CMEs and associated dimming regions

  • Run-Time: 2016-2017
  • Project Goals: In the low plasma beta corona, the restructuring of the magnetic field dictates the dynamics of a coronal mass ejection (CME), i) by setting the properties of the internal magnetic field of the CME which will generate the outward Lorentz force acting on the presumed flux rope, and ii) by altering the confining properties of the ambient coronal field. Studying CME kinematics close to the Sun thus gives unique information on the net force acting on the CME during its formation and, therefore, the magnetic energy injected in the flux rope. This early-evolution phase is also crucial for a better understanding of CME dynamics in interplanetary space. On statistical basis, the lower the CME starts in the corona the faster the maximum acceleration and speed that is reached (Bein et al., 2011, ApJ 738, article id. 191). In this respect, shock formation of fast CMEs is another key point, which is not fully understood by our current knowledge about CMEs. We will use data from a combination of instruments which are capable of observing in detail the low corona in intensity as well as magnetic and Doppler fields. These instruments will deliver ground-breaking new data in order to adequately address the early CME acceleration as well as shock formation processes and magnetic field restructuring, a key issue for a better understanding of CME dynamics in interplanetary space and forecasting of space weather.
  • Team-AT: Karin Dissauer, Manuela Temmer (PI), Julia Thalmann, Kamalam Vanninathan, Astrid M. Veronig