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The Astrophysical Journal, 704:485495, 2009 October 10 doi:10.1088/0004-637X/704/1/485 C 2009. The American Astronomical Society. All rights reserved. Printed in the U.S.A.
 

Summary: The Astrophysical Journal, 704:485­495, 2009 October 10 doi:10.1088/0004-637X/704/1/485
C 2009. The American Astronomical Society. All rights reserved. Printed in the U.S.A.
FAN­SPINE TOPOLOGY FORMATION THROUGH TWO-STEP RECONNECTION DRIVEN BY TWISTED
FLUX EMERGENCE
T. T¨or¨ok1
, G. Aulanier1
, B. Schmieder1
, K. K. Reeves2
, and L. Golub2
1 LESIA, Observatoire de Paris, CNRS, UPMC, Universit´e Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France
2 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
Received 2009 May 13; accepted 2009 August 26; published 2009 September 23
ABSTRACT
We address the formation of three-dimensional nullpoint topologies in the solar corona by combining Hinode/
X-ray Telescope (XRT) observations of a small dynamic limb event, which occurred beside a non-erupting
prominence cavity, with a three-dimensional (3D) zero- magnetohydrodynamics (MHD) simulation. To this
end, we model the boundary-driven "kinematic" emergence of a compact, intense, and uniformly twisted flux tube
into a potential field arcade that overlies a weakly twisted coronal flux rope. The expansion of the emerging flux
in the corona gives rise to the formation of a nullpoint at the interface of the emerging and the pre-existing
fields. We unveil a two-step reconnection process at the nullpoint that eventually yields the formation of a

  

Source: Aulanier, Guillaume - Observatoire de Paris

 

Collections: Physics