On the Anti-correlation between Spectral Line Broadening and Intensity in Coronal Structures Observed with EIS

Details On the Anti-correlation between Spectral Line Broadening and Intensity in Coronal Structures Observed with EIS On the Anti-correlation between Spectral Line Broadening and Intensity in Coronal Structures Observed with EIS

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...742..101s&link_type=abstract

The Astrophysical Journal, Volume 742, Issue 2, article id. 101 (2011).

Astronomy and Astrophysics

Astronomy

1

Sun: Corona, Sun: Uv Radiation, Techniques: Spectroscopic

Scientific paper

The advance in spectral resolution of the Extreme Ultraviolet Imaging (EIS) spectrometer on board Hinode has allowed for more detailed analysis of coronal spectral lines. Large line broadening and blueshifted velocities have been found in the periphery of active region (AR) cores and near the footpoints of coronal loops. This line broadening is yet to be understood. We study the correlation of intensity and line width for entire ARs and sub-regions selected to include coronal features. The results show that although a slight positive correlation can be found when considering whole images, many sub-regions have a negative correlation between intensity and line width. Sections of a coronal loop display some of the largest anti-correlations found for this study with the increased line broadening occurring directly adjacent to the footpoint section of the loop structure, not at the footpoint itself. The broadened lines may be due to a second Doppler-shifted component that is separate from the main emitting feature such as a coronal loop, but related in their excitation. The small size of these features forces the considerations of investigator and instrumental effects. Preliminary analyses are shown that indicate the possibility of a point-spread function that is not azimuthally symmetric and may affect velocity and line profile measurements.

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