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Observed heights of EUV lines formed in the transition zone and corona

✍ Scribed by George W. Simon; Robert W. Noyes

Publisher: Springer
Year: 1972
Tongue: English
Weight: 451 KB
Volume: 22
Category: Article
ISSN: 0038-0938
DOI: 10.1007/bf00148710

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✦ Synopsis

The heights of formation of a number of extreme ultraviolet lines in active regions have been measured from OSO-IV spectroheliograms. Using the Lyman continuum at 2000 km above the white light limb as a reference, we find heights for Hel, Heir, CIH, NIH, OIv, OvI, Nevm, Mgx, SixII, Fexv and Fexvf that are in approximate agreement with models based on analysis of EUV emission intensities. The height of Cn is anomalously high. The accuracy of measurement is typically about 2000 kin. The data suggest that the transition zone is less steep than calculated from EUV emission intensities; however, higher resolution observations are necessary to resolve the discrepancy.

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