@article{oai:nagoya.repo.nii.ac.jp:00024761,
 author = {Ishiguro, N. and Kusano, K.},
 issue = {2},
 journal = {The Astrophysical Journal},
 month = {Jul},
 note = {The stability of the magnetic field in the solar corona is important for understanding the causes of solar eruptions.<br/>Although various scenarios have been suggested to date, the tether-cutting reconnection scenario proposed by<br/>Moore et al. is one of the widely accepted models to explain the onset process of solar eruptions. Although the<br/>tether-cutting reconnection scenario proposes that the sigmoidal field formed by internal reconnection is the<br/>magnetic field in the pre-eruptive state, the stability of the sigmoidal field has not yet been investigated<br/>quantitatively. In this paper, in order to elucidate the stability problem of the pre-eruptive state, we developed a<br/>simple numerical analysis in which the sigmoidal field is modeled by a double arc electric current loop and its<br/>stability is analyzed. As a result, we found that the double arc loop is more easily destabilized than the<br/>axisymmetric torus, and it becomes unstable even if the external field does not decay with altitude, which is in<br/>contrast to the axisymmetric torus instability. This suggests that tether-cutting reconnection may well work as the<br/>onset mechanism of solar eruptions, and if so, the critical condition for eruption under a certain geometry may be<br/>determined by a new type of instability rather than by the torus instability. Based on them, we propose a new type<br/>of instability called double arc instability (DAI). We discuss the critical conditions for DAI and derive a new<br/>parameter κ, defined as the product of the magnetic twist and the normalized flux of the tether-cutting<br/>reconnection.},
 pages = {101--101},
 title = {Double Arc Instability in the Solar Corona},
 volume = {843},
 year = {2017}
}