Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2810a&link_type=abstract
American Astronomical Society Meeting 210, #28.10; Bulletin of the American Astronomical Society, Vol. 39, p.137
Other
1
Scientific paper
The orbits of the two STEREO spacecraft A(head) and B(ehind) move to progressively larger stereoscopic separation angles a, with a=1.2 deg on March 1, a=3.0 deg on April 1, a=6.0 deg on May 1, and a=10.5 deg on June 1. This range of small-angle separation enables the first 3D triangulation of coronal features. Active region loops at 1 MK have a scale height of 50 Mm, for which the parallax effect amounts up to 7 EUVI pixels at a 10 deg separation angle. We present the first triangulations of active region loops, with the goal to reconstruct the 3D geometry along entire loop lengths. Such 3D reconstructions yield the inclination angles of loop planes, which allow us to test the relation between projected and vertical hydrostatic density scale heights. Another important application is how the 3D geometry of the stereoscopically reconstructed loops relates to theoretical (potential, linear and nonlinear force-free) magnetic field extrapolations. We attempt also to reconstruct the 3D geometry of filaments and to track their motion in 3D before eruption and onset of flares and CMEs. - This work is supported by the NASA STEREO under NRL contract N00173-02-C-2035.
Aschwanden Markus J.
Lemen James
Nitta Nariaki
Wuelser J.
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