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Observations of Plasma Upflow in a Warm Loop with Hinode/EIS
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Durgesh Tripathi Submitted: 2012-06-17 08:15
A complete understanding of Doppler shift in active region loops can
help probe the basic physical mechanism involved into the heating of
those loops. Here we present observations of upflows in coronal loops
detected in a range of temperature temperatures (log, T=5.8 - 6.2).
The loop was not discernible above these temperatures. The speed of
upflow was strongest at the footpoint and decreased with height. The
upflow speed at the footpoint was about 20 km s-1 in
FeVIII which decreased with temperature being about
13 km s-1 in FeX, about 8 km
s-1 in FeXII and about 4 km
s-1 in FeXIII. To the best of our
knowledge this is the first observation providing evidence of upflow
of plasma in coronal loop structures at these temperatures. We
interpret these observations as evidence of chromospheric evaporation
in quasi-static coronal loops.
Authors: Durgesh Tripathi, Helen E. Mason, Giulio Del Zanna, and Steve Bradshaw
Projects: Hinode/EIS
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Publication Status: Accepted for publication in ApJ Letters
Last Modified: 2012-06-17 12:31
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