Post on 10-Jan-2016
description
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
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.]
E W
N
S
+¯
Sun Flux rope
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 Halpha images , i.e., large and dark enough
There is no complex filament system in the source region.
August 9, 2000 event
~2.5 days later
October 9, 2000 event
~3.5 days later
November 18, 2003 event
~2 days later
70~90°
47°
Consistent with the central part of the filament
Inconsistent
Leading front
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?