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Peter Young   Submitted: 2007-08-31 04:20

Quiet Sun and active region spectra from the Hinode/EIS instrument are presented, and the strongest lines from different temperature regions discussed. A list of emission lines recommended to be included in EIS observation studies is presented based on analysis of blending and diagnostic potential using the CHIANTI atomic database. In addition we identify the most useful density diagnostics from the ions covered by EIS.

Authors: P.R. Young, G. Del Zanna, H.E. Mason, K.P. Dere, E. Landi, M. Landini, G.A. Doschek, C.M. Brown, J.L. Culhane, L.K. Harra, T. Watanabe, H. Hara
Projects: Hinode

Publication Status: Accepted for PASJ Hinode special issue
Last Modified: 2007-08-31 18:06
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Peter Young   Submitted: 2007-08-31 04:19

Two types of active region feature prominent at transition region temperatures are identified in Hinode/EIS data of AR 10938 taken on 2007 January 20. The footpoints of 1 MK TRACE loops are shown to emit strongly in emission lines formed at log T=5.4-5.8, allowing the temperature increase along the footpoints to be clearly seen. A density diagnostic of Mg VII yields the density in the footpoints, with one loop showing a decrease from 3x109 cm-3 at the base to 1.5x109 cm-3 at a projected height of 20 Mm. The second feature is a compact active region transition region brightening which is particularly intense in O V emission (log T=5.4) but also has a signature at temperatures up to log T=6.3. The Mg VII diagnostic gives a density of 4x1010 cm-3, and emission lines of Mg VI and Mg VII show line profiles broadened by 50 km s-1 and wings extending beyond 200 km s-1. Continuum emission in the short wavelength band is also found to be enhanced, and is suggested to be free-bound emission from recombination onto He^+.

Authors: P. R. Young, G. Del Zanna, H. E. Mason, G. A. Doschek, J. L. Culhane, H. Hara
Projects: Hinode

Publication Status: Accepted for PASJ Hinode special issue
Last Modified: 2007-08-31 18:06
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