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- W1669663139 abstract "The Yohkoh Soft X-ray Telescope (SXT) is a grazing incidence telescope. Temperature and emission measure maps can be obtained from the ratio of a pair of images in two filters that have different transmissions, assuming that each pixel or line of sight is dominated by plasma of a single temperature. Because of the broad temperature sensitivity of each filter, caution must be made when interpreting such filter ratio temperatures in the presence of plasmas of different temperatures along the line of sight. Here, we analyze SXT data in three filters in terms of two simple forms of differential emission measure (DEM), namely two delta functions and a single Gaussian. We also study how departure from the isothermal assumption affects the predicted radio brightness temperatures at 17 GHz, the primary frequency of the Nobeyama Radio Heliograph. Within the range of temperatures SXT can see, the effect is found to be quite small. Therefore, we need to assume the presence of much cooler (T 1 MK) plasma, if the brightness temperature calculated from the SXT filter ratio temperature and emission measure is significantly higher than observed (c.f., Hanaoka 1999)." @default.
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- W1669663139 date "1999-12-01" @default.
- W1669663139 modified "2023-09-27" @default.
- W1669663139 title "Temperature structure of non-flaring loops" @default.
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