HR: 09:00h
AN: SH41B-04 [Abstracts]
TI: 3D Geometry of Coronal Loops Measured with STEREO / EUVI
AU: * Aschwanden, M J
EM: aschwanden@lmsal.com
AF: Solar & Astrophysics Lab., Lockheed Martin ATC
3251 Hanover St., Org. ADBS, Bldg. 252, Palo Alto, CA 94304, United States
AU: Wuelser, J
EM: wuelser@lmsal.com
AF: Solar & Astrophysics Lab., Lockheed Martin ATC
3251 Hanover St., Org. ADBS, Bldg. 252, Palo Alto, CA 94304, United States
AU: Nitta, N
EM: nitta@lmsal.com
AF: Solar & Astrophysics Lab., Lockheed Martin ATC
3251 Hanover St., Org. ADBS, Bldg. 252, Palo Alto, CA 94304, United States
AU: Lemen, J
EM: lemen@lmsal.com
AF: Solar & Astrophysics Lab., Lockheed Martin ATC
3251 Hanover St., Org. ADBS, Bldg. 252, Palo Alto, CA 94304, United States
AB:
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.
UR: http://www.lmsal.com/~aschwand/
DE: 7509 Corona
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Fall Meeting