Abstract
Yohkoh and the Coronal Diagnostic Spectrometer (CDS) on the Solar and Heliospheric observatory (SOHO) jointly observed two brightenings in active region NOAA 7981 on 6 August 1996. Combining the UV data from CDS with information from the high time resolution coronal images obtained with the Soft X-ray Telescope (SXT) on Yohkoh, provides us with important information on the relationship between the transition region and corona, our observations show that cool plasma (T e = 2.2 × 105 K) can lie at the same altitude as the hot coronal plasma (T e = 1–4 × 106 K). The lower temperature structure is not formed from the cooling of the hotter coronal loop. We are also able to observe a low temperature cut-off of T e = 1–4 x 106 K for a loop which repeatedly brightened over the period of approximately one day.
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© 1997 Springer Science+Business Media Dordrecht
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Matthews, S.A., Harra-Murnion, L.K. (1997). The Relationship Between UV and X-ray Active Region Structures. In: Fleck, B., Švestka, Z. (eds) The First Results from SOHO. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5236-5_30
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DOI: https://doi.org/10.1007/978-94-011-5236-5_30
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