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太陽雑誌会速報 2003.10.06 Takako T. Ishii

Topics : Sigmoids, Twists, Eruptions. 太陽雑誌会速報 2003.10.06 Takako T. Ishii. What is the role of the kink instability in solar coronal eruptions? R.J. Leamon 1 , R.C. Canfield 1 , Z. Blehm 1 & A.A. Pevtsov 2 1 Dept. of Physics, Montana State Univ.

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太陽雑誌会速報 2003.10.06 Takako T. Ishii

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  1. Topics: Sigmoids, Twists, Eruptions 太陽雑誌会速報 2003.10.06 Takako T. Ishii What is the role of the kink instability in solar coronal eruptions? R.J. Leamon1, R.C. Canfield1, Z. Blehm1 & A.A. Pevtsov2 1Dept. of Physics, Montana State Univ. 2National Solar Observatory / Sacrament Peak ApJ Letter, 596 (2003 Oct. 20) , rapid release Received: 2002 Dec. 11 Accepted: 2003 Sep. 04 Published: 2003 Sep. 29

  2. Sigmoid → Arcade, Eruption Kink instability Force free field; L: separation between endpoints of a loop g: shear angle at which the central line crosses the line joining its endpoints ⇒ SXT images: 191 sigmoids (1991 Oct. ～2000 Oct.) T: total twist ⇒ Mees Solar Observaotiry vector magnetograms → abest (1991 Oct. ～1998 Dec.) L g Pevtsov et al. 1997 Pevtsov et al. 1995, Longcope et al. 1998

  3. Distributions of sing Measured Corrected for projection effect Average: 32 deg. 30 deg. 90 deg.

  4. Distributions of L Measured Corrected for projection effect Average: 160 Mm 100,000 km 400,000 km

  5. Number of eruptions per active regions (scaled per solar disk transit) No relationbetween sing and eruption Linear fit 1s Not all sigmoids erupt

  6. Distributions of total coronal twist T (25 flare-associated eruptive events) Broad distribution Many eruptions: T < 0.5p T > Tc= 2p (unstable to the MHD kink mode) hour hour hour Long duration events

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