First stereoscopic polar plume reconstructions from STEREO/SECCHI images

Astronomy and Astrophysics – Astrophysics

Scientific paper

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7500 Solar Physics, Astrophysics, And Astronomy, 7511 Coronal Holes, 7513 Coronal Mass Ejections (2101), 7519 Flares, 7524 Magnetic Fields

Scientific paper

We present the first stereoscopic reconstruction of the three-dimensional structures of polar plumes based on the two simultaneously recorded images taken by the EUVI telescopes in the SECCHI instrument package onboard the recently launched STEREO mission. The reconstructed polar plumes were observed on April 7th, 2007 when the two spacecraft were well below the solar equatorial plane, an appropriate time for the observation of the plumes in the south polar coronal hole. The heliocentric separation of the two spacecraft was 3.6 degrees at that time. We determine locations of the footpoints of five EUV polar plumes on the solar surface as well as their inclinations relative to the line-of-sight and to their local radial directions. The five plumes are all within 21 degrees of the south pole and their inclinations to the line-of-sight of STEREO A(head) and radial directions are on average 107 degrees and 28 degrees, respectively. A simple dipole model for the south pole's magnetic field does not provide a good correspondence with the obtained inclinations. Of the three plumes in front of the limb only one is associated with an EUV bright point.

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