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Solar Physics

, Volume 252, Issue 2, pp 283–292 | Cite as

EIS/Hinode Observations of Doppler Flow Seen through the 40-Arcsec Wide-Slit

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Abstract

The Extreme ultraviolet Imaging Spectrometer (EIS) onboard Hinode is the first solar telescope to obtain wide-slit spectral images that can be used for detecting Doppler flows in transition region and coronal lines on the Sun and to relate them to their surrounding small-scale dynamics. We select EIS lines covering the temperature range 6×104 to 2×106 K that give spectrally pure images of the Sun with the 40-arcsec slit. In these images Doppler shifts are seen as horizontal brightenings. Inside the image it is difficult to distinguish shifts from horizontal structures but emission beyond the image edge can be unambiguously identified as a line shift in several lines separated from others on their blue or red side by more than the width of the spectrometer slit (40 pixels). In the blue wing of He ii, we find a large number of events with properties (size and lifetime) similar to the well-studied explosive events seen in the ultraviolet spectral range. Comparison with X-Ray Telescope (XRT) images shows many Doppler shift events at the footpoints of small X-ray loops. The most spectacular event observed showed a strong blue shift in the transition region and lower corona lines from a small X-ray spot that lasted less than 7 min. The emission appears to be near a cool coronal loop connecting an X-ray bright point to an adjacent region of quiet Sun. The width of the emission implies a line-of-sight velocity of 220 km s−1. In addition, we show an example of an Fe xv shift with a velocity of about 120 km s−1, coming from what looks like a narrow loop leg connecting a small X-ray brightening to a larger region of X-ray emission.

Keywords

Corona: quiet Jets Transition region 
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Copyright information

© The Author(s) 2008

Authors and Affiliations

  • D. E. Innes
    • 1
  • R. Attie
    • 1
  • H. Hara
    • 2
  • M. S. Madjarska
    • 1
  1. 1.Max-Planck Institut für SonnensystemforschungKatlenburg-LindauGermany
  2. 2.National Astronomical ObservatoryMitaka, TokyoJapan

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