UK APAP Network
Lead Research Organisation:
University of Strathclyde
Department Name: Physics
Abstract
Plasmas permeate our Universe, being present in stellar atmospheres, interstellar gas clouds in galaxies, planetary nebulae, supernova remnants, black hole accretion disks, and so on. Spectroscopy of all these objects has shown a richness of information, in particular in the spectral lines that are emitted by the ions that are present in the plasmas. In recent years, an overwhelming amount of XUV spectroscopic data have been obtained from missions such as Chandra, XMM-Newton, HST, FUSE, SOHO. The state of matter in each object --- the distribution of temperature and density, chemical composition, flow velocities --- can be determined through diagnostic analysis of spectral data in which models, incorporating the full physics of the object, confront the observations. This information is fundamental for our understanding of the origin and evolution of the Universe. Collisions of electrons and photons with atoms, ions and molecules play a fundamental role in astrophysical plasmas, and it is therefore necessary that accurate atomic data are calculated. It might be surprising, but a large fraction of the spectra produced by ions is still unexplored. Large discrepancies between observations and theory are also still present. For example, there are order-of-magnitude anomalies in the derived elemental abundances in H II regions and Planetary Nebulae. A mis-match between observation and theory is also present in the X-ray spectra of Active Galactic Nuclei (AGN). We intend to perform new calculations of electron-ion recombination rate coefficients to address these discrepancies. In recent years, we have shown the need to perform accurate R-matrix calculations of electron-ion collisions for individual ions, in order to solve the large, long-standing discrepancies between observed and calculated line intensities in collisional (astrophysical and laboratory) plasmas. We propose extending these calculations to all isolectronic sequences from H-like up to Na-like, providing a comprehensive and accurate dataset for all important ions. The theoretical data need to be assessed and benchmarked against astrophysical and laboratory measurements, in particular, in order to identify spectral lines and to provide accurate wavelengths and uncertainty estimates. We intend to provide all of these fundamental and derived data to the wider user community by setting up a web-based archive which will contain all of the atomic data needed to interpret, with physical modelling, the spectra of astrophysical and laboratory plasmas. With this proposal, we aim to strengthen the collaboration between experimental, observational and theoretical research.
Organisations
Publications
Dere Kenneth P.
(2019)
CHIANTI - an atomic database for emission lines - Paper XV: Version 9, improvements for the X-ray satellite lines
in arXiv e-prints
Del Zanna G.
(2019)
The EUV spectrum of the Sun: quiet and active Sun irradiances and chemical composition
in arXiv e-prints
Dufresne R. P.
(2019)
Modelling ion populations in astrophysical plasmas: carbon in the solar transition region
in arXiv e-prints
Winebarger Amy
(2018)
Unfolding overlapped slitless imaging spectrometer data for extended sources
in arXiv e-prints
Madsen Chad A.
(2019)
Coronal Plasma Characterization via Coordinated Infrared and Extreme Ultraviolet Observations of a Total Solar Eclipse
in arXiv e-prints
Mao J
(2020)
R -matrix electron-impact excitation data for the N-like iso-electronic sequence
in Astronomy & Astrophysics
Mulay S
(2017)
Cool and hot emission in a recurring active region jet
in Astronomy & Astrophysics
Mulay S
(2016)
Multiwavelength study of 20 jets that emanate from the periphery of active regions
in Astronomy & Astrophysics
Mulay S
(2017)
Temperature and density structure of a recurring active region jet
in Astronomy & Astrophysics
Liang G
(2009)
R -matrix electron-impact excitation data for the Na-like iso-electronic sequence
in Astronomy & Astrophysics
Liang G
(2011)
R -matrix electron-impact excitation data for the Li-like iso-electronic sequence including Auger and radiation damping
in Astronomy & Astrophysics
Del Zanna G
(2011)
Benchmarking atomic data for astrophysics: Fe xiii EUV lines
in Astronomy & Astrophysics
Polito V
(2017)
Analysis and modelling of recurrent solar flares observed with Hinode/EIS on March 9, 2012
in Astronomy & Astrophysics
Del Zanna G
(2015)
CHIANTI - An atomic database for emission lines. Version 8
in Astronomy & Astrophysics
Nisticò G
(2017)
Multi-instrument observations of a failed flare eruption associated with MHD waves in a loop bundle
in Astronomy & Astrophysics
Del Zanna G
(2013)
Spectral diagnostics with the SDO EVE flare lines
in Astronomy & Astrophysics
Del Zanna G
(2013)
A revised radiometric calibration for the Hinode/EIS instrument
in Astronomy & Astrophysics
Del Zanna G
(2012)
Benchmarking atomic data for the CHIANTI atomic database: coronal lines observed by Hinode EIS
in Astronomy & Astrophysics
Del Zanna G
(2011)
Benchmarking atomic data for astrophysics: Fe XVII X-ray lines
in Astronomy & Astrophysics
Polito V
(2017)
Analysis and modelling of recurrent solar flares observed with Hinode/EIS on March 9, 2012
in Astronomy & Astrophysics
Polito V
(2016)
Density diagnostics derived from the O iv and S iv intercombination lines observed by IRIS
in Astronomy & Astrophysics
Del Zanna G
(2009)
Benchmarking atomic data for astrophysics: Fe XVII EUV lines
in Astronomy & Astrophysics
Fang X
(2011)
New effective recombination coefficients for nebular N ii lines
in Astronomy & Astrophysics
Liang G
(2011)
R -matrix electron-impact excitation data for astrophysically abundant sulphur ions
in Astronomy & Astrophysics
Del Zanna G
(2013)
The multi-thermal emission in solar active regions
in Astronomy & Astrophysics
Nisticò G
(2017)
Multi-instrument observations of a failed flare eruption associated with MHD waves in a loop bundle
in Astronomy & Astrophysics
Del Zanna G
(2009)
Benchmarking atomic data for astrophysics: Fe VIII EUV lines
in Astronomy & Astrophysics
Schmidt E
(2008)
Electron-ion recombination for $\ion{Fe}{viii}$ forming $\ion{Fe}{vii}$ and $\ion{Fe}{ix}$ forming $\ion{Fe}{viii}$: measurements and theory
in Astronomy & Astrophysics
Liang G
(2009)
R -matrix electron-impact excitation data for B-like Si and its application in cool stars
in Astronomy & Astrophysics
Fernández-Menchero L
(2016)
Scaling of collision strengths for highly-excited states of ions of the H- and He-like sequences
in Astronomy & Astrophysics
Liang G
(2010)
R -matrix electron-impact excitation data for the Ne-like iso-electronic sequence
in Astronomy and Astrophysics
Del Zanna G
(2010)
Benchmarking atomic data for astrophysics: Fe xi
in Astronomy and Astrophysics
Del Zanna G
(2010)
Atomic data from the IRON project LXVIII. Electron impact excitation of Fe xi
in Astronomy and Astrophysics
Badnell N. R.
(2006)
Dielectronic recombination of Fe
3pq ions:: A key ingredient for describing X-ray absorption in active galactic nuclei
in ASTROPHYSICAL JOURNAL
Lukic D. V.
(2007)
Dielectronic recombination of Fe xv forming Fe xiv: Laboratory measurements and theoretical calculations
in ASTROPHYSICAL JOURNAL
Allison H
(2018)
Determination of the Equatorial Electron Differential Flux From Observations at Low Earth Orbit
in Journal of Geophysical Research: Space Physics
Allison H
(2017)
The magnetic local time distribution of energetic electrons in the radiation belt region
in Journal of Geophysical Research: Space Physics
Giarrusso M
(2018)
High resolution spectropolarimetry: from Astrophysics to ECR plasmas
in Journal of Instrumentation
Liang G
(2009)
R -matrix inner-shell electron-impact excitation of the Na-like iso-electronic sequence
in Journal of Physics B: Atomic, Molecular and Optical Physics
Dubernet M
(2016)
The virtual atomic and molecular data centre (VAMDC) consortium
in Journal of Physics B: Atomic, Molecular and Optical Physics
Badnell N
(2016)
Atomic processes for astrophysical plasmas
in Journal of Physics B: Atomic, Molecular and Optical Physics
Liang G
(2008)
R -matrix inner-shell electron-impact excitation of Fe 15+ including Auger-plus-radiation damping
in Journal of Physics B: Atomic, Molecular and Optical Physics
Fernández-Menchero L
(2016)
Importance of the completeness of the configuration interaction and close coupling expansions in R -matrix calculations for highly charged ions: electron-impact excitation of Fe 20+
in Journal of Physics B: Atomic, Molecular and Optical Physics
Young P
(2016)
The CHIANTI atomic database
in Journal of Physics B: Atomic, Molecular and Optical Physics
Del Zanna G
(2018)
Solar UV and X-ray spectral diagnostics.
in Living reviews in solar physics
Temple M
(2020)
Fe iii emission in quasars: evidence for a dense turbulent medium
in Monthly Notices of the Royal Astronomical Society
Del Zanna G
(2016)
Atomic data and density diagnostics for S iv
in Monthly Notices of the Royal Astronomical Society
| Title | APAP |
| Description | Atomic Data for Astrophysics |
| Type Of Material | Database/Collection of data |
| Provided To Others? | Yes |
| Impact | Improved diagnostic modelling of astrophysical and magnetic fusion plasmas. |
| URL | http://www.apap-network.org/ |