Evidence for a Pre-Eruptive Twisted Flux Rope Using the Themis Vector Magnetograph

Details Evidence for a Pre-Eruptive Twisted Flux Rope Using the Themis Vector Magnetograph Evidence for a Pre-Eruptive Twisted Flux Rope Using the Themis Vector Magnetograph

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...693l..27c&link_type=abstract

The Astrophysical Journal Letters, Volume 693, Issue 1, pp. L27-L30 (2009).

Astronomy and Astrophysics

Astronomy

22

Mhd, Sun: Corona, Sun: Magnetic Fields

Scientific paper

Although there is evidence that twisted structures form during large-scale eruptive events, it is not yet clear whether these exist in the pre-eruptive phase as twisted flux ropes (TFRs) in equilibrium. This question has become a major issue since several theoretical mechanisms can lead to the formation of TFRs. These models consider either the evolution of a coronal configuration driven by photospheric changes or the emergence of TFR from the convection zone. We consider as a target for addressing this issue the active region NOAA AR 10808 known at the origin of several large-scale eruptive phenomena, and associated with the emergence of a δ-spot. Using the THEMIS vector magnetogram as photospheric boundary conditions for our nonlinear force-free reconstruction model of the low corona and without any other assumption, we show that the resulting pre-eruptive configuration exhibits a TFR above the neutral line of the emerging δ-spot. In addition, the free magnetic energy of this configuration could even be large enough to explain such resulting large-scale eruptive events.

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