Tag Archives: Sun

Influence of Departures from LTE on Oxygen Abundance Determination

Sitnova, T. M. (1,2), Mashonkina, L. I. (1) and Ryabchikova, T. A. (1) ((1) Institut of Astronomy of RAS, Moscow, Russia; (2) Moscow M.V. Lomonosov State University, Moscow, 119991 Russia) We performed non-LTE calculations for O I with the plane-parallel … Continue reading

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NLTE analysis of Sr lines

Bergemann, M. (1), Hansen, C. J. (2) Bautista, M. (3) and Ruchti, G. (4) ((1) Max-Planck Institute for Astrophysics, Karl-Schwarzschild Str. 1, 85741, Garching, Germany; (2) Landessternwarte, Königstuhl 12, 69117, Heidelberg, Germany; (3) Department of Physics, Western Michigan University, Kalamazoo, … Continue reading

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The Solar oxygen abundance as derived using MHD atmospheric models

Damian Fabbian (Instituto de Astrofísica de Canarias, Spain) We present our initial results on the re-determination of the solar chemical composition using 3D photospheric models that include magnetic fields, a method for the first time employed in determining  the Sun’s … Continue reading

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The Solar oxygen abundance

Martin Asplund (Australian National University, Australia) I will review the solar oxygen abundance. I will also discuss how this relates to helioseismology and the current solar modeling problem. Finally I will present a comparison of the solar O abundance with … Continue reading

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Neon Insights from Old Solar X-rays: a Plasma Temperature Dependence of the Coronal Neon Content

J.J. Drake (Smithsonian Astrophysical Observatory) An analysis using modern atomic data of fluxes culled from the literature for O VIII and Ne IX lines observed in solar active regions by the P78 and Solar Maximum Mission satellites confirms that the coronal … Continue reading

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Testing EUV/X-ray Atomic Data for the Solar Dynamics Observatory

Paola Testa (1), Jeremy J. Drake (1), Enrico Landi (2) ((1) Smithsonian Astrophysical Observatory, (2) Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor) The Atmospheric Imaging Assembly (AIA) and the Extreme-ultraviolet Variability Experiment (EVE) onboard the Solar … Continue reading

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Impact of nonthermal tails and nonthermal distributions on solar flare plasma diagnostics

Jaroslav Dudík (1,2), Elena Dzifčáková (2), Michal Homola (1), Marian Karlický (2), Alena Kulinová (1,2), Jana Kašparová (2) (1) DAPEM, Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia.  (2) Astronomical Institute of the Academy of Sciences, Ondřejov, Czech Republic. The presence of nonthermal, … Continue reading

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Role of input atomic data in spectroscopic analyses of the Sun and metal-poor stars

Maria Bergemann (Max-Planck Institute for Astrophysics) Analysis of high-resolution stellar spectra relies heavily upon atomic data. These include energy levels, wavelengths, cross-sections for various types of interactions between particles and photons, such as photoionization and collision induced transitions. Quantum-mechanical calculations … Continue reading

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Solar plasma spectroscopy: achievements and future challenges

Claudio Mendoza (IVIC/CeCalCULA) During 13-15 of September 2010, we had the privilege of attending the symposium “Solar plasma spectroscopy: achievements and future challenges“, held at the Department of Applied Mathematics and Theoretical Physics (DAMTP) in the Centre for Mathematical Sciences … Continue reading

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