Learn More
The CHIANTI atomic database contains atomic energy levels, wavelengths, radia-tive transition probabilities and electron excitation data for a large number of ions of astrophysical interest. Version 4 has been released, and proton excitation data is now included, principally for ground configuration levels that are close in energy. The fitting procedure for(More)
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(More)
A detailed study of emission lines from Fe vii, Fe viii and Fe ix observed by the EUV Imaging Spectrometer on board the Hinode satellite is presented. Spectra in the ranges 170–212Å and 246–292Å show strongly enhanced lines from the upper solar transition region (temperatures 5.4 ≤ log T ≤ 5.9) allowing a number of new line identifications to be made.(More)
In the present work the element abundances in an active region observed on the solar disk are studied using EUV spectral lines observed by the Coronal Diagnostic Spectrometer (CDS) on board of SOHO. Making use of the large number of lines identified in the CDS spectral range and of the instrument imaging capability, the abundances of several elements having(More)
We study the Differential Emission Measure distribution of two pairs of active and quiet regions of the solar atmosphere , observed by CDS Normal Incidence Spectrometer (NIS) on SOHO, and investigate their temperature and density structure. Use is made of the Arcetri Method (Landi & Landini 1997) for DEM and density diagnostics. An iterative method for(More)
By examining solar observations using the Normal Incidence Spectrometer (NIS) within the Coronal Diagnostic Spectrometer (CDS) on board SOHO, an isothermal region in the lower solar corona was chosen for analysis by three different temperature diagnostic techniques. These techniques are the line-ratio method, the Differential Emission Measure and the(More)