The influence of the stray-light component in determining coronal temperature structures |
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Authors: | Juan Hao and Mei Zhang |
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Institution: | 1.Key Laboratory of Solar Activity, National Astronomical Observatories,Chinese Academy of Sciences,Beijing,China |
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Abstract: | We use a few solar partial eclipse observations made by XRT/Hinode to estimate the influence of stray-light component in determining
coronal temperature structures. Our analysis shows that the stray light will largely affect the estimation of coronal temperature
and change the estimated temperature structure in one coronal hole region. The stray lights mildly influence the estimated
temperatures in one quiet Sun region and do not change the estimated temperature structure. This implies that the influence
of stray lights differs from one region to another, and definitely needs to be considered in some regions. Whereas a carefully
estimated point-spread-function is needed to remove the stray light component, our study shows that by a simple approach such
as subtracting the average intensity of distant (e.g. >1.4 solar radius) points from the data values, the influence of stray
light can be largely removed, at least for the two regions we study here. |
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