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Solar Erupting Filaments and Magnetic Field Configurations of IP Magnetic Clouds

Solar Erupting Filaments and Magnetic Field Configurations of IP Magnetic Clouds. Yuming Wang 1, 2 & Jie Zhang 1 (Presenting) 1 George Mason University 2 University of Science & Technology of China. Paper by Wang, et al., ApJ, 651, 2006. GMU 10-2006.

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Solar Erupting Filaments and Magnetic Field Configurations of IP Magnetic Clouds

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  1. Solar Erupting Filaments and Magnetic Field Configurations of IP Magnetic Clouds Yuming Wang1, 2 & Jie Zhang1 (Presenting) 1George Mason University 2University of Science & Technology of China Paper by Wang, et al., ApJ, 651, 2006 GMU 10-2006

  2. It is generally believed that the axial orientation of MCs is parallel to the long axis of filaments. [e.g., Bothmer and Schwenn 1994; Bothmer and Rust 1997; Marubashi 1997; McAllister et al. 2001; Yurchyshyn et al. 2001; Jing et al. 2004; Rust et al. 2005.] N Flux rope Sun + ¯ E W S

  3. Here, we further take the curvature of filament axis into account, when compared with MC axis • Three filament-MC events are analyzed. The selection of filaments satisfies the following criteria: • The filament and its orientation is well observed in Halphaimages , i.e., large and dark enough • There is no complex filament system in the source region.

  4. August 9, 2000 event

  5. ~2.5 days later

  6. October 9, 2000 event

  7. ~3.5 days later

  8. November 18, 2003 event

  9. ~2 days later

  10. 70~90° Leading front Consistent with the central part of the filament Inconsistent 47°

  11. Why is the axis of MCs not consistent with that of filaments for some events? • A CME is a large scale phenomenon, in which filament itself (seen in Halpha) is only a small part of the eruptive magnetic structure [e.g., Harrison & Lyons 2000; Plunkett et al. 2001]. • A MC is also a large scale structure. The in-situ observation only see a line through the 3-D MC. • A CME may rotate when it moves outward [e.g., Fan & Gibson 2004; Torok & Kliem 2005]. • Error in fitting the observations of magnetic clouds • When the filament is curved, what portion correspond to the axis of MC?

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