HR: 0800h
AN: SH21B-0422 [Abstracts]
TI: 3D Sun Loop Tracer: A Tool for Stereoscopy of Coronal Loops for NASA's STEREO Mission
AU: * Hall, J R
EM: jeffrey.r.hall@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, Mail Stop 168-414,
4800 Oak Grove Drive, Pasadena, CA 91109
AU: Sheth, P
EM: sheth@caltech.edu
AF: Jet Propulsion Laboratory, California Institute of Technology, Mail Stop 168-414,
4800 Oak Grove Drive, Pasadena, CA 91109
AU: DeJong, E
EM: Eric.M.Dejong@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, Mail Stop 168-414,
4800 Oak Grove Drive, Pasadena, CA 91109
AU: Lorre, J
EM: Jean.J.Lorre@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, Mail Stop 168-414,
4800 Oak Grove Drive, Pasadena, CA 91109
AU: Liewer, P
EM: paulett.liewer@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, Mail Stop 168-414,
4800 Oak Grove Drive, Pasadena, CA 91109
AB:
Stereoscopy and triangulation can be used to determine the three-dimensional geometry of coronal loops seen in simultaneous
images from the two STEREO spacecraft. Here we demonstrate a new tool 3D Sun Loop Tracer (SLT) that uses stereoscopy to
determine the 3D structure of a loop that can be identified in both images. SLT proceeds in several stages. First, the user
"seeds" the tool by selecting the same loop in two simultaneous images. The user identifies any point on the same loop in the
first image and any point on the same loop in the second image. The selected points can be anywhere on the loop. Next,
separately for each image, the loop segment is traced automatically using an algorithm which follows edges. Last, the two
traces are fed to a triangulation program that matches the two segments to find corresponding "tiepoints" and performs the
inversion to obtain the (x,y,z) coordinates of points on the loop. The tool has been developed and tested using a
physics-based synthetic 3D coronal (K. Schrijver, private communication). We show that the method produces accurate results
for loop reconstruction over a wide range of stereo angles.
DE: 7500 SOLAR PHYSICS, ASTROPHYSICS, AND ASTRONOMY
DE: 7509 Corona
DE: 7513 Coronal mass ejections
DE: 7519 Flares
DE: 7594 Instruments and techniques
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2004 AGU Fall Meeting