5:15 PM - 6:30 PM
[PEM04-P04] Double Arc Instability in the solar corona
Keywords:Sun, solar flare, instability
The objective of this study is to analyze the stability of double-arc loop theoretically. We model double-arc electric current loop using two circular tori connected each other, and numerically calculate the stability of it. As the result, we found that the double-arc current loop can be destabilized even if the external field is uniform in contrast to the TI. The results indicate that the Double-Arc Instability (DAI) is different from the TI. The decay index which is used as a criteria for TI is not applicable to DAI. Furthermore, we found that in order to make the DAI the twist of magnetic field line must be larger than one-half. We also show that the growth of DAI is similar to the observation of flux eruption. These results indicate that the DAI caused by the tether cutting reconnection is a possible scenario, which can well explain how solar eruption can be triggered.