Stereoscopic Polar Plume Reconstructions from Stereo/Secchi Images
L. Feng, B. Inhester, S. K. Solanki, K. Wilhelm, T. Wiegelmann, B., Podlipnik, R. A. Howard, S. P. Plunkett, J. P. Wuelser, and W. Q. Gan

TL;DR
This study uses stereoscopic imaging from STEREO spacecraft to reconstruct polar plumes in 3D, analyzing their structure, inclination, density, temperature, and flow speeds, and comparing them with magnetic field models.
Contribution
First 3D reconstructions of polar plumes from STEREO data, revealing their superradial expansion, inclination, and relationship with magnetic fields and plasma properties.
Findings
Plumes show superradial expansion in 3D.
Plumes are inclined more horizontally than the dipole field.
Electron densities decrease with height along plumes.
Abstract
We present stereoscopic reconstructions of the location and inclination of polar plumes of two data sets based on the two simultaneously recorded images taken by the EUVI telescopes in the SECCHI instrument package onboard the \emph{STEREO (Solar TErrestrial RElations Observatory)} spacecraft. The ten plumes investigated show a superradial expansion in the coronal hole in 3D which is consistent with the 2D results. Their deviations from the local meridian planes are rather small with an average of . By comparing the reconstructed plumes with a dipole field with its axis along the solar rotation axis, it is found that plumes are inclined more horizontally than the dipole field. The lower the latitude is, the larger is the deviation from the dipole field. The relationship between plumes and bright points has been investigated and they are not always associated. For the first…
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