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Structure and Dynamics of Quiescent Filament Channels Observed by Hinode/XRT and STEREO/EUVI View all abstracts by submitter

Yingna Su   Submitted: 2010-08-06 08:03

We present a study on the structure and dynamics of quiescent filament channels observed by Hinode/XRT and STEREO/EUVI at the solar minimum 23/24 from December 2006 to December 2008. For 12 channels identified on the solar disk (Group I channels), we find that the morphology of the structure on the two sides of the channel is asymmetric in both X-rays and EUV: eastern side has curved features while the western side has straight features. We interpret the results in terms of a magnetic flux rope model. The asymmetry in the morphology is due to the variation in axial flux of the flux rope along the channel, which causes the field lines from one polarity to turn into the flux rope (curved feature), while the field lines from the other polarity are connected to very distant sources (straight). For most of the 68 channels identified by cavities at the east and west limbs (Group II channels), the asymmetry cannot be clearly identified, which is likely due to the fact that the axial flux may be relatively constant along such channels. Corresponding cavities are identified only for 5 of the 12 Group I channels, while Group II channels are identified for all of the 68 cavity pairs. The studied filament channels are often observed as dark channels in X-rays and EUV. Sheared loops within Group I channels are often seen in X-rays, but are rarely seen in Group II channels as shown in the XRT daily synoptic observations. A survey on the dynamics of studied filament channels shows that filament eruptions occur at an average rate of 1.4 filament eruptions per channel per solar rotation.

Authors: Yingna Su, Adriaan van Ballegooijen, Leon Golub
Projects: Hinode/XRT

Publication Status: 2010 ApJ, 721, 901
Last Modified: 2011-04-06 09:08
Go to main E-Print page  Evidence for Mixed Helicity in Erupting Filaments  Dynamics and plasma properties of an X-ray jet from SUMER, EIS, XRT and EUVI A & B simultaneous observations  Edit Entry  Download Preprint  Delete Entry 

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