EGU2020-4011
https://doi.org/10.5194/egusphere-egu2020-4011
EGU General Assembly 2020
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

On the Relation between Filament Chirality, Rotation Direction, and Morphology

Zhenjun Zhou1,2,5, Rui Liu2,3, Xing Cheng4, Chaowei Jiang1, Yuming Wang2,3, Lijuan Liu5,3, Guoqiang Wang1, Tielong Zhang1, and Jun Cui5,3
Zhenjun Zhou et al.
  • 1Institute of Space Science and Applied Technology, Harbin Institute of Technology (Shenzhen), Shenzhen, China
  • 2Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei, China
  • 3CAS Center for Excellence in Comparative Planetology, China
  • 4School of Astronomy and Space Science, Nanjing University, Nanjing, China
  • 5School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai, Guangdong, China

Coronal mass ejections (CMEs) with enhanced south-component of the magnetic field are susceptible to producing geomagnetic storms. Filament chirality, rotation direction, and morphology are responsible for CMEs’ magnetic orientation and they are manifestations of magnetic helicity. However, different models predict different relations among them. In this paper, taking advantage of stereoscopic observations and a new method of determining the chirality of erupting filaments, we analyze 12 filaments that present a clear rotation during the eruption. The results based on the small sample support the argument that the filaments with for sinistral (dextral) chirality, they rotate clockwise (counterclock-wise), indicating the transformation of twist into writhe. Moreover, we also inspect soft X-ray and EUV hot temperature images and find that, the associated sigmoids are consistent with filaments prior to the eruption morphologically. However, once starting to rise up, the erupting filaments reverse their shapes from forward S-shaped to inversed S-shaped and vice versa.

How to cite: Zhou, Z., Liu, R., Cheng, X., Jiang, C., Wang, Y., Liu, L., Wang, G., Zhang, T., and Cui, J.: On the Relation between Filament Chirality, Rotation Direction, and Morphology, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-4011, https://doi.org/10.5194/egusphere-egu2020-4011, 2020.