Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-04-03
Astronomy and Astrophysics
Astrophysics
8 pages, 9 figures, to appear in the proceedings of the symposium 'New Visions of the X-ray Universe in the XMM-Newton and Cha
Scientific paper
The 1s2-1s2l lines are the most intense He-like ions lines. They are used as spectroscopic diagnostics for solar active regions as well as for different laboratory plasmas. Nowadays, it exits very high spectral resolution instruments and, for intense X-ray sources, one can do spectroscopic diagnostics from line ratios. With XMM (RGS) and Chandra (LETGS, HETGS) spectral resolutions and for several atomic elements, it is particularly possible to separate a 3 blended line set, the so-called He-like triplet: Resonance (r), Intercombination (i) and Forbidden (f), which are dominated respectively by lines issued from the following levels : 1s2p 1P1, 1s2p 3P1,2 and 1s2s 3S1. We shall show that the measurement of two different ratios between these 3 lines (R = f/i and G = (f + i)/r) give quantitative informations on the nature of the emitting plasma (photo-ionized or collisional) and on its electronic density and temperature. A more refined analysis must also include satellite line contributions.
Dubau Jacques
Porquet Delphine
No associations
LandOfFree
Helium-like triplet diagnostics does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Helium-like triplet diagnostics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Helium-like triplet diagnostics will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-339822