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Investigating SUMER Coronal Hole Observations: A Robust Method of Raster Reduction  

Alisdair R Davey   Submitted: 2006-03-22 15:16

We present a physically constrained, comprehensive and robust means of reducing long-duration spectroscopic raster observations made in the important 1530 AA{} to 1555 AA{} wavelength range by the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) instrument on the Solar and Heliospheric Observatory ({em SOHO}). Our method performs corrections in spatial, spectral and temporal domains following application of the standard SUMER data reduction package to minimize the net Doppler shift of neutral and singly-ionized silicon emission lines in the chromosphere. We have applied this method to seven raster observations of the same equatorial coronal hole acquired over a five-day period, 1999 November 3-8, and to the well-studied observations of 1996 September 21-22. This technique allows us to make physically consistent analyses of multiple SUMER rasters and will aid in future investigations of the solar ``rest'' wavelength of the important ion{Ne}{8} 770 AA{} emission line and, as a result, on the properties of transition region blue-shifts - specifically their correlation to multi-thermal radiance structure, super-granular network patterns and the coronal magnetic environment at the perceived lower boundary of solar wind outflow.

Authors: Alisdair R. Davey, Scott W. McIntosh and Donald M. Hassler
Projects: SoHO-EIT,SoHO-SUMER

Publication Status: ApJS July 2006 v165n1 386-399
Last Modified: 2006-11-30 10:00
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Investigating SUMER Coronal Hole Observations: A Robust Method of Raster Reduction

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