Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...692.1294w&link_type=abstract
The Astrophysical Journal, Volume 692, Issue 2, pp. 1294-1304 (2009).
Astronomy and Astrophysics
Astronomy
15
Atomic Processes, Line: Formation, Sun: Corona, Sun: Flares, Sun: Uv Radiation
Scientific paper
The diagnostic capability of Fe XIII line features seen in the 170-210 Å waveband of the EUV Imaging Spectrometer (EIS) on Hinode is investigated, with emphasis on density diagnostics applied to solar active regions. Four diagnostic line pairs are found to yield consistent densities ranging from 108.5 to 109.5 cm-3 across an active region using a new theoretical model of the ion. In separate EIS observations of a small flare, the widely used line pair, Fe XIII λ203.8/λ202.0, is found to reach the high density limit predicted by a new theoretical model of the iron ion.
Hara Hisayuki
Kato Daisuke
Kato Taichi
Murakami Iwanori
Nakamura Nobuhiro
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