Velocity Structure of Jets in a Coronal Hole

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 Spectromet...

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Bibliographic Details
Published in:Publications of the Astronomical Society of Japan 2007-11, Vol.59 (sp3), p.S757-S762
Main Authors: Kamio, Suguru, Hara, Hirohisa, Watanabe, Tetsuya, Matsuzaki, Keiichi, Shibata, Kazunari, Culhane, Len, Warren, Harry P.
Format: Article
Language:English
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Summary: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 30 km s $^{-1}$ 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.
ISSN:0004-6264
2053-051X
DOI:10.1093/pasj/59.sp3.S757