2009/07/20 by E. Landi, Peter R. Young, P. R. Young · 55 citations
Physics and Astronomy · #Astro and Planetary Science #Astronomy #Atomic physics #Emission spectrum #Extreme ultraviolet #Extreme ultraviolet lithography #Imaging spectrometer #Ion #Materials science #Optics #Physics #Plasma #Solar and Space Plasma Dynamics #Spectral line #Spectrometer #Stellar, planetary, and galactic studies #astro-ph.SR
paper · pdf · doi:10.1088/0004-637x/706/1/1
published in The Astrophysical Journal 706(1), 1-20 (IOP Publishing) · 46 pages, submitted to ApJ
arxiv created 2009/07/20 · openalex publication_date 2009/10/27 · arxiv updated 2015/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
In this work we report on a cold, bright portion of an active region observed by Hinode/EIS. The emitting plasma was very bright at transition region temperatures, and the intensities of lines of ions formed between 105-106 K were enhanced over normal values. The data set constitutes an excellent laboratory where the emission of transition region ions can be tested. We first determine the thermal structure of the observed plasma, and then we use it 1) to develop a spectral atlas, and 2) to assess the quality of CHIANTI atomic data by comparing predicted emissivities with observed intensities. We identify several lines never observed before in solar spectra, and find an overall excellent agreement between CHIANTI predicted emissivities and observations.