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Observation of Sigmoids with Solar-B

Explore the secrets of solar sigmoids with Solar-B K. Hori at Hiraiso Solar Observatory. Learn about their classification, interlocking loops, and connection with eruptions. Discover the physical processes involved in their formation and evolution. Temperature diagnosis, flares, and magnetic structure insights are examined.

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Observation of Sigmoids with Solar-B

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  1. Observation of Sigmoids with Solar-B K.Hori (Hiraiso Solar Observatory, CRL)

  2. Sigmoids Classification After Pevtsov 2002 Interlocking Loops (Eruptive) Multiple Loops Single Loop (Eruptive) Inter-Region Sigmoid

  3. Secrets of Sigmoids - Magnetic topology (e.g., helicity, shear buildup) Priest 1992; Titov et al．1993; Rust&Kumar 1996; Demoulin et al. 1997; Amari et al. 2000…. - Connection with Eruptions (e.g., missing mass deduced from dimming, CMEs) Hudson&Webb 1997; Sterling&Hudson1997 Canfield et al. 2000; Glover et al. 2000…. - Formation and Evolution of Sigmoids Sigmoid→Arcade/Cusp Physical process involved in the formation of sigmoids is still not clear.

  4. By linkage of two initially unconnected bipoles/ARs? Martens & Zwaan 2001 Formation of Sigmoids By emerging below the photosphere as a part of a twisted flux tube? Matsumoto et al. 1998; Magara and Longcope 2001,…

  5. 18-Oct-1994 Temperature Diagnosis of Interlocking Sigmoids

  6. 19-Oct-1994 Goes M3 Moore et al. 2001 Case1: AR Sigmoid SXT Al1+AlMg 19:00:20-19:34:10 20:32:12-20:49:36 20:50:08-20:53:28 Flare Early in the rise phase (MK)

  7. Case2: AR Sigmoid 25-Oct-1994, C4.7 Manoharan et al.1996 van Driel-Gesztelyi et al. 2000 SXT Al1+AlMg 09:47:09-09:50:21 10:00:39-10:03:55 11:28:55-11:32:11 Short Loops (MK)

  8. Case3: Sigmoidal Filament 8-May-2000 B6.8 Yohkoh SXT 17GHz (NoRH) Hα May 7 Hiraiso 5 10 km May 8 Hida, FMT 04:35 04:00 04:26

  9. 17GHz dark patch: Manifestation of low temperature regions (Tb < 10 K ) 4 May 7 May 8 04:26:25 05:09:05 Heating has started. The midpoint remained to be cold.

  10. 04:58:00 05:10:00 05:36:00 Sigmoid Evolution in Hα • Bifurcation and disappearance of the eastern half of the filament. • B6.8 Two-ribbon flare 08:09:31 SXT

  11. Magnetic Structure of Interlocking Sigmoids = + ? ?

  12. Yohkoh SXTwas the best observational tool to reveal the secrets of Sigmoids if..... • the observations were not interrupted so often by Yohkoh nights. • the SXR brightness of flare regions were notsaturated. →Exposure time, temperature range • velocity and magnetic field maps could be obtained simultaneously with temperature and EM maps. →XRT,SOT,EIS

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