Coronal Plasma Motions in Active Region Loops Observed with Hinode EIS

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Scientific paper

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Scientific paper

The Hinode EUV Imaging Spectrometer (EIS) has revealed the presence of high-velocity upflow components of nearly coronal sound speed near the footpoints of active region loops in a quiescent active region. The upflow is detected as subsonic line shifts with enhanced line broadenings when the emission line fitting by a Gaussian function is applied to the line-profile analysis for hot coronal emission lines, and it contributes to the line broadening because of the multiple components within the EIS spatial resolution, suggesting the presence of spatially unresolved upflows and the smallness of each heating volume.

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