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Solar Phys (2012) 276:199217 DOI 10.1007/s11207-011-9886-3
 

Summary: Solar Phys (2012) 276:199217
DOI 10.1007/s11207-011-9886-3
Interchange Slip-Running Reconnection and Sweeping
SEP Beams
S. Masson G. Aulanier E. Pariat K.-L. Klein
Received: 2 May 2011 / Accepted: 23 October 2011 / Published online: 22 November 2011
Springer Science+Business Media B.V. 2011
Abstract We present a new model to explain how particles (solar energetic particles; SEPs),
accelerated at a reconnection site that is not magnetically connected to the Earth, could even-
tually propagate along the well-connected open flux tube. Our model is based on the results
of a low- resistive magnetohydrodynamics simulation of a three-dimensional line-tied and
initially current-free bipole, which is embedded in a non-uniform open potential field. The
topology of this configuration is that of an asymmetric coronal null point, with a closed fan
surface and an open outer spine. When driven by slow photospheric shearing motions, field
lines, initially fully anchored below the fan dome, reconnect at the null point, and jump to
the open magnetic domain. This is the standard interchange mode as sketched and calcu-
lated in 2D. The key result in 3D is that reconnected open field lines located in the vicinity
of the outer spine keep reconnecting continuously, across an open quasi-separatrix layer, as
previously identified for non-open-null-point reconnection. The apparent slipping motion of
these field lines leads to formation of an extended narrow magnetic flux tube at high altitude.

  

Source: Aulanier, Guillaume - Observatoire de Paris

 

Collections: Physics