This page (revision-16) was last changed on 11-Dec-2017 16:06 by Ignacio Ugarte-Urra

This page was created on 16-Jun-2010 22:23 by PeterYoung

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Spatial offset of intensity and velocity features
Spatial offset of intensity and velocity features

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[fe8_footpoints.png]
[{Image src = 'fe8_footpoints.png' width='700'}]
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[psf.png]
[{Image src = 'psf.png' width='300'}]
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If a velocity map is created at the south pole, then it is found that there is ridge of blueshift along the limb as shown in the thumbnail velocity map below, obtained from the Oslo Hinode Science Center.
If a velocity map is created at the south pole, then it is found that there is ridge of blueshift along the limb as shown in the thumbnail velocity map below, obtained from the Oslo Hinode Science Center. This is again consistent with the tilted PSF.
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A key point to note is that the tilted PSF only effects features where there is a significant intensity gradient, thus the main result of Tian et al. (2010) - the measurement of blueshifts in a large area of largely uniform intensity coronal hole - is not affected.
There is currently no software or prescription available to correct velocity maps for the tilted PSF. The following is a general observation:
The velocity shifts due to the PSF are around the 5 km/s level. I.e., if a velocity of V km/s is measured at the intensity peak (along the Y-direction), then a velocity of up to V+5 km/s will be measured to the south of the brightening, and a velocity of up to V-5 km/s will be measured to the north of the brightening. These shifts occur at about 3-4 pixels away from the intensity peak (see the footpoint image earlier in this document}.
This page (revision-16) was last changed on 11-Dec-2017 16:06 by Ignacio Ugarte-UrraTop