Observed Heights of EUV Lines Formed in the Transition Zone and Corona

Details Observed Heights of EUV Lines Formed in the Transition Zone and Corona Observed Heights of EUV Lines Formed in the Transition Zone and Corona

Feb 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972soph...22..450s&link_type=abstract

Solar Physics, Volume 22, Issue 2, pp.450-458

Physics

12

Scientific paper

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 He i, He ii, C iii, N iii, O iv, O vi, Ne viii, Mg x, Si xii, Fe xv and Fe xvi that are in approximate agreement with models based on analysis of EUV emission intensities. The height of C ii is anomalously high. The accuracy of measurement is typically about 2000 km. 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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