Velocity Structure of Jets in a Coronal Hole
Abstract
The velocity structures of jets in a coronal hole have been derived for the first time. Hinode observations revealed the existence of many bright points in coronal holes. They are loop-shaped and sometimes associated with coronal jets. Spectra obtained with the Extreme-ultraviolet Imaging Spectrometer aboard Hinode were analyzed to infer the Doppler velocity of bright loops and jets in a coronal hole of the north polar region. Elongated jets above bright loops are found to be blue-shifted by 30kms-1 at maximum, while foot points of bright loops are red-shifted. Blue-shifts detected in coronal jets are interpreted as being upflows produced by magnetic reconnection between emerging flux and the ambient field in the coronal hole.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- November 2007
- DOI:
- 10.1093/pasj/59.sp3.S757
- arXiv:
- arXiv:0711.2848
- Bibcode:
- 2007PASJ...59S.757K
- Keywords:
-
- Sun: atmospheric motions;
- Sun: corona;
- Sun: UV radiation;
- Astrophysics
- E-Print:
- 11 pages, 7 figures, accepted for publication in PASJ Hinode special issue