CHIANTI—An Atomic Database for Emission Lines. X. Spectral Atlas of a Cold Feature Observed with Hinode/EUV Imaging Spectrometer
Abstract
In this work, we report on a cold, bright portion of an active region observed by the Hinode/EUV Imaging Spectrometer. The emitting plasma was very bright at transition region temperatures, and the intensities of lines of ions formed between 105 and 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 very good agreement between CHIANTI-predicted emissivities and observations.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 2009
- DOI:
- 10.1088/0004-637X/706/1/1
- arXiv:
- arXiv:0907.3490
- Bibcode:
- 2009ApJ...706....1L
- Keywords:
-
- atomic data;
- line: identification;
- Sun: corona;
- Sun: transition region;
- Sun: UV radiation;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 46 pages, submitted to ApJ