Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1403m&link_type=abstract
American Astronomical Society, SPD meeting #42, #14.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a new model to explain how particles, accelerated at a reconnection site that is not magnetically connected to the Earth, could eventually propagate along the well-connected open flux tube. Our model is based on the results of a low beta resistive MHD simulation of a 3D line-tied and initially current-free bipole, that 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 anchored at both feet 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 calculated in 2D. The key result in 3D is that, after the interchange, and just as found earlier in non-open null-point reconnection, reconnected open field lines located in the vicinity of the outer spine keep reconnecting continuously, across an open quasi-separatrix layer. The apparent slipping motion of these field lines leads to forming an extended narrow magnetic flux tube at high altitude. Because of the slip-running reconnection, we conjecture that if energetic particles would be traveling through, or be accelerated inside, the diffusion region, they would be successively injected along continuously reconnecting field lines, that are connected farther and farther from the spine. At the scale of the full Sun, owing to the super-radial expansion of field lines below 3 Rs, such energetic particles could easily be injected in field lines slipping over significant distances, and could eventually reach the distant flux tube that is well connected to the Earth.
Aulanier Guillaume
Klein Karsten
Masson Sophie
Pariat Etienne
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