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- W2024882162 abstract "We present the results of Solar and Heliospheric Observatory Ultraviolet Coronagraph Spectrometer (SOHO/UVCS) and Yohkoh Soft X-Ray Telescope (SXT) observations above an active region complex (AR 8194, 8195, and 8198) at the southeast limb on 1998 April 6-7. This active region complex appears to be the base of a small streamer seen by the Large Angle and Spectrometric Coronagraph Experiment (LASCO/C2) at the southeast limb. The UVCS was offset-pointed to observe low in the corona from 1.22 up to 1.6 R☉ with normal pointing. High-temperature lines such as [Fe XVIII] λ974 and Ne IX λ1248 were present in this region, implying that the electron temperature is higher than that in the quiet-Sun corona. This region of the corona is also seen as particularly bright in the Yohkoh/SXT, SOHO EUV Imaging Telescope high-temperature filter (Fe XV λ284) and SOHO/LASCO C1. The electron temperature analysis indicates a two-temperature structure, one of ~1.5 × 106 K, which is similar to that observed in quiet-Sun streamers, and the other at a high temperature of ~3.0 × 106 K. This two-temperature region likely corresponds to two distinct coronal regions overlapping in the line of sight. We compare the electron temperature and emission measure results from the SOHO/UVCS data with those from the Yohkoh/SXT data. The absolute elemental abundances show a general first ionization potential effect and decrease with height for all the elements. This is consistent with the effect of gravitational settling, which, however, cannot totally account for the observed elemental abundances. Other mechanisms that are likely to affect the coronal elemental abundance are discussed." @default.
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- W2024882162 date "2002-10-20" @default.
- W2024882162 modified "2023-10-08" @default.
- W2024882162 title "Solar and Heliospheric ObservatoryUltraviolet Coronagraph Spectrometer andYohkohSoft X‐Ray Telescope Observations of the High‐Temperature Corona above an Active Region Complex" @default.
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- W2024882162 doi "https://doi.org/10.1086/342616" @default.
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