Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...678l..67h&link_type=abstract
The Astrophysical Journal, Volume 678, Issue 1, pp. L67-L71.
Astronomy and Astrophysics
Astronomy
60
Sun: Atmospheric Motions, Sun: Corona, Sun: Uv Radiation
Scientific paper
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.
Culhane Leonard J.
Doschek George A.
Hara Hirohisa
Harra Louise K.
Mariska John T.
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