期刊
ASTRONOMY & ASTROPHYSICS
卷 574, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201424394
关键词
atomic data; techniques: spectroscopic; Sun: corona; line: identification
资金
- STFC (UK) through the University of Cambridge DAMTP astrophysics consolidated grant
- University of Strathclyde UK APAP network [ST/J000892/1]
- Science and Technology Facilities Council [ST/L000636/1, ST/J001570/1, PP/E004857/2, ST/J000892/1] Funding Source: researchfish
- STFC [ST/J001570/1, PP/E004857/2, ST/J000892/1, ST/L000636/1] Funding Source: UKRI
We investigate the main spectral diagnostics for Si III UV lines, which have been previously used to measure electron densities, temperatures, and to suggest that non-Maxwellian electron distributions might be present in the low transition region of the solar atmosphere. Previous atomic calculations and observations are reviewed. We benchmark the observations using a new large-scale R-matrix scattering calculation for electron collisional excitation of Si III, carried out with the intermediate-coupling frame transformation (ICFT) method. We find generally good agreement between predicted and observed line intensities, if one takes into account the different temperature sensitivity of the lines, and the structure of the solar transition region. We find no conclusive evidence for the presence of non-Maxwellian electron distributions.
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