منابع مشابه
Laboratory measurements of the x-ray line emission from neon-like Fe XVII
We have conducted a systematic study of the dominant x-ray line emission from Fe XVII. These studies include relative line intensities in the optically thin limit, intensities in the presence of radiation from satellite lines from lower charge states of iron, and the absolute excitation cross sections of some of the strongest lines. These measurements were conducted at the Lawrence Livermore Na...
متن کاملFeXVII X-ray lines in solar coronal and laboratory plasmas
Theoretical intensities of the Fe xviiX-ray lines due to transitions 2p6 − 2p53d (near 15 Å) and 2p6 − 2p53s (near 17 Å) are presented, and compared with solar flare and active region spectra. The ratio of the 15 Å lines to the 17 Å lines is a function of temperature Te, but for solar spectra this is not of practical use because of the resonance scattering of the intense 15.015 Å line. Instead ...
متن کاملDo solar decimetric spikes originate in coronal X-ray sources?
Context. In the standard solar flare scenario, a large number of particles are accelerated in the corona. Nonthermal electrons emit both X-rays and radio waves. Thus, correlated signatures of the acceleration process are predicted at both wavelengths, coinciding either close to the footpoints of a magnetic loop or near the coronal X-ray source. Aims. We attempt to study the spatial connection b...
متن کاملX-ray Line Ratios of F-like Fe XVIII and Ni XX
The intensity ratios of 3 → 2 emission lines of Fe XVIII and Ni XX were measured on the Livermore electron beam ion trap (EBIT-I) with a flat-field grating spectrometer. The results were compared with distorted-wave (DW) calculations obtained with the Flexible Atomic Code and recent close-coupling calculations using the R-matrix code. The measured 3s → 2p/3d → 2p ratios are about 20–40% higher ...
متن کاملElectron distributions in X-Ray plasmas: spectral diagnostics with the 3s/3d line ratio in Fe XVII
Efforts to benchmark astrophysical observations with X-ray laboratory measurements have been stymied by observed and measured differences of up to a factor of two in the ratio ’3s/3d’ of Fexvii lines at λλ ∼ 17Å and ∼ 15Å respectively. Using the electron distribution function (EDF) as a new physical parameter, we compute the Fexvii line ratios and account for these differences. Based on large-s...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1984
ISSN: 0252-9211
DOI: 10.1017/s0252921100085535