Understanding the Initiation of Polar Coronal Jets with STEREO/SECCHI Stereoscopic Observations

Details Understanding the Initiation of Polar Coronal Jets with STEREO/SECCHI Stereoscopic Observations Understanding the Initiation of Polar Coronal Jets with STEREO/SECCHI Stereoscopic Observations

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh23a..02v&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SH23A-02

Other

7509 Corona, 7526 Magnetic Reconnection (2723, 7835)

Scientific paper

Polar coronal jets are collimated transient ejections of plasma occurring in polar coronal holes. The kinematics and mostly the 3D morphology of jets place strong constraints on the physical mechanism(s) responsible for their initiation, and were not accessible before the STEREO mission. We report on the first stereoscopic observations of polar coronal jets made by the EUVI/SECCHI imagers on-board the twin STEREO spacecraft at spacecraft separations of ~ 11° and ~ 45°. Triangulations of the jet locations in simultaneous image pairs led to the true 3D position and thereby their kinematics. The most important geometrical feature of the observed jets is helical structures showing evidence of untwisting. The jet structure appear strikingly different from each of the two STEREO viewpoints: face-on in the one viewpoint and edge-on in the other. This provides solid evidence that the observed helical structure is real and not resulting from possible projection effects of single viewpoint observations. The clear demonstration of twisted structure in polar jets compares favorably with synthetic images from a recent MHD simulation of jets invoking magnetic untwisting as their driving mechanism.

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