Laboratory demonstration of slow-rise to fast-acceleration of arched magnetic flux ropes
We demonstrate the slow rise to fast acceleration of an arched plasma-filled magnetic flux rope. The flux rope expansion is inhibited by an externally applied customizable strapping field. When the strapping field is not too strong and not too weak, expansion forces build up while the flux rope is in the strapping field region. When the flux rope moves to a critical height beyond the peak strapping field region, the plasma accelerates quickly corresponding to the observed slow rise to fast acceleration of solar eruptions. This behavior is in agreement with the predictions of the torus instability.
© 2016 American Geophysical Union. Accepted manuscript online: 26 August 2016; Manuscript Accepted: 24 August 2016; Manuscript Revised: 18 August 2016; Manuscript Received: 25 May 2016. We thank Dave Felt for his technical assistance. This material is based upon work supported by the National Science Foundation under award 1059519, by the Air Force Office of Scientific Research under award FA9550-11-1-0184, and by the U.S. Department of Energy Office of Science, Office of Fusion Energy Sciences under award DE-FG02-04ER54755 and DE-SC0010471. Experimental data are available upon request.
Published - Ha_et_al-2016-Geophysical_Research_Letters.pdf