3D Reconstruction of Polar Plumes From STEREO/SECCHI Images.

Details 3D Reconstruction of Polar Plumes From STEREO/SECCHI Images. 3D Reconstruction of Polar Plumes From STEREO/SECCHI Images.

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh44a..05f&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH44A-05

Physics

7509 Corona, 7511 Coronal Holes, 7524 Magnetic Fields, 7549 Ultraviolet Emissions

Scientific paper

We provide a newly developed approach to determine the 3D structure of high latitude open magnetic fields as visible in polar plumes. Our data are image pairs taken by the SECCHI-EUVI telescopes on board of the two STEREO spacecraft. From these image pairs we identify the plumes by two different methods. The first method identifies the plume axes by the local intensity maxima and the second method uses image processing tools such as the Hough Transform. The Hough Transform transfers plumes from images into points, called Hough coordinates, which can directly be used to calculate the 3D location of the plume. The automatic plume detection by the Hough transform method is well suited to study their temporal evolution. The capability of our code has been investigated with synthetic images taken from a 3D magnetohydrostatic corona model (Neukirch, 1995) and we apply our methods to study polar plumes observed from two vantage viewpoints. We identify the locations of the footpoints of the polar plumes in the photosphere as well as their inclination relative to the line-of-sight and to their local radial direction. The relationship between plume and bright point are investigated. With the help of SOHO/SUMER observations we derive the density scale height in the plumes. We found that plumes are not the main contributor to the fast solar wind.

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