Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.446..269d&link_type=abstract
8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and Corona. Proceedings of the Conference hel
Astronomy and Astrophysics
Astrophysics
4
Scientific paper
On-disc EUV observations of the solar corona and transition region with the Coronal Diagnostic Spectrometer (CDS) on SOHO are presented and discussed. Spectroscopic diagnostic techniques using the CHIANTI atomic database are applied to give an estimate of plasma parameters such as electron density (from density-sensitive line ratios) and relative element abundances in the transition region. Transition region densities present consistently higher values in the network, compared to the cell-centre areas. Various methods for deriving element abundances (when studying the FIP effect) from EUV spectra are compared and their limitations presented. Elemental abundances are derived from transition region emission lines and discussed in relation to the magnetic structure of the observed features (quiet sun, coronal holes and plumes).
Bromage Barbara J. I.
Del Zanna Giulio
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