Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 678, Issue 1, Pages L67-L71Publisher
IOP PUBLISHING LTD
DOI: 10.1086/588252
Keywords
Sun : atmospheric motions; Sun : corona; Sun : UV radiation
Categories
Funding
- STFC [PP/E001173/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/D002907/1, PP/E001173/1] Funding Source: researchfish
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The solar active region 10938 has been observed from the disk center to the west limb with the Hinode EUV Imaging Spectrometer. In the disk-center observation, subsonic upflow motions of tens of km s(-1) and enhanced nonthermal velocities have been found near the footpoints of the active region loops assuming a single Gaussian approximation for the emission-line profiles. When the same part of the active region is observed near the limb, both upflows and enhanced nonthermal velocities essentially decrease. There is a strong correlation between Doppler velocity and nonthermal velocity. Significant deviations from a single Gaussian profile are found in the blue wing of the line profiles for the upflows. These suggest that there are unresolved high-speed upflows. We discuss the implications for coronal heating mechanisms.
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