Multiple Component Outflows in an Active Region Observed with the EUV Imaging Spectrometer on Hinode

We have used the Extreme Ultraviolet Imaging Spectrometer on the Hinode spacecraft to observe large areas of outflow near an active region. These outflows are seen to persist for at least 6 days. The emission line profiles suggest that the outflow region is composed of multiple outflowing components...

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Bibliographic Details
Published in:The Astrophysical journal 2010-06, Vol.715 (2), p.1012-1012
Main Authors: Bryans, P, Young, P. R, Doschek, G. A
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
DOPPLER EFFECT
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION
EXTREME ULTRAVIOLET RADIATION
Imaging spectrometers
IRON
MAIN SEQUENCE STARS
METALS
Outflow
PHOTON EMISSION
RADIATIONS
STARS
SUN
TRANSITION ELEMENTS
ULTRAVIOLET RADIATION
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Summary:We have used the Extreme Ultraviolet Imaging Spectrometer on the Hinode spacecraft to observe large areas of outflow near an active region. These outflows are seen to persist for at least 6 days. The emission line profiles suggest that the outflow region is composed of multiple outflowing components, Doppler-shifted with respect to each other. We have modeled this scenario by imposing a double-Gaussian fit to the line profiles. These fits represent the profile markedly better than a single-Gaussian fit for Fe XII and XIII emission lines. For the fastest outflowing components, we find velocities as high as 200 km s{sup -1}. However, there remains a correlation between the fitted line velocities and widths, suggesting that the outflows are not fully resolved by the double-Gaussian fit and that the outflow may be comprised of further components.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/715/2/1012