Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh41b..04a&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH41B-04
Other
7509 Corona
Scientific paper
Using images from the STEREO/EUVI A and B spacecraft we developed an accurate method that performs stereoscopic triangulation and reconstruction of the 3D geometry of curvi-linear structures in the solar corona, such as loops, filaments, prominence threads, or wave features. We test the coalignment of stereoscopic images and establish an accuracy of better than <0.1 pixels in east-west direction, <0.3 pixels in north-south direction, and <0.05 degrees in roll angle. We reconstruct the 3D geometry of some 100 coronal loops loops in active regions in May 2007, when the spacecraft had a separation angle of ~10 degrees. We find that complete loops or incomplete segments of loops can only be reconstructed up to altitudes of about one hydrostatic scale height, which is h<50 Mm at a coronal temperature of T=1 MK. The determination of the 3D geometry of coronal loops is an important and necessary step to model their hydrodynamic structure. We show also that this method can be used to determine quantitatively the eigen-motion, oscillation, twisting, expansion, acceleration, or other dynamics of coronal loops, erupting filaments, and MHD wave fronts, in particular in association with flares and CMEs.
Aschwanden Markus J.
Lemen James
Nitta Nariaki
Wuelser J.
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