Observation of Sigmoids with Solar-B

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Presentation transcript:

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

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

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&Hudson 1997 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.

Formation of Sigmoids 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,…　　

Temperature Diagnosis of Interlocking Sigmoids 18-Oct-1994

Case1: AR Sigmoid 19-Oct-1994 Goes M3 SXT Al1+AlMg Moore et al. 2001　 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)

van Driel-Gesztelyi et al. 2000 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)

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

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.

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

Interlocking Sigmoids Magnetic Structure of Interlocking Sigmoids = + ? ?

Yohkoh SXT was 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 not saturated. →　Exposure time, temperature range velocity and magnetic field maps could be obtained simultaneously with temperature and EM maps. →XRT,SOT,EIS