Description:Advanced Diagnostics of Astrophysical Plasmas
Abstract:<b>Description of the application:</b>
The ADAP projects develops new techniques for the spectroscopic analysis and modelling of optically thin Astrophysical Plasmas in the UV - soft X - rays domain. Such an enterprise is driven by the necessity of improving our knowledge of the complex phenomena taking place in the magnetised plasma of the outer solar atmosphere, like those leading to the heating of the corona, flares, coronal mass ejection and the solar wind.
The techniques make use of calculation of electron and photon collisional data and of state population densities for atoms and ions for deriving the plasma emissivity. The electron and photon collisional data involve the calculation of fundamental atomic parameters, using the R-matrix method, tailored to astrophysical conditions and to ions of astrophysical interest. The atomic population processing is based on recent developments of the Generalised Collisional Radiative (GCR) theory, successfully applied to laboratory plasmas, which includes an accurate dependence on electron density via the explicit treatment of metastable and high-lying energy levels, and an accurate treatment of the dielectronic recombination. This open the possibility of realistic calculations of the plasma emissivity in extreme cases, like those deriving from inhomogeneities and impulsive energy injections.
The software being developed for the PI2S2 infrastructure exploits the GRID paradigm for the calculation of large databases of fundamental and derived data for advanced diagnostics and dynamic modelling.
<b>Experiment:</b> Coronal Diagnostic Spectrograph (CDS) and Solar Ultraviolet Measurements of Emitted Radiation (SUMER) experiments on-board the Solar and Heliospheric Observatory (SOHO) spacecraft
<B>Partners</b>: ADAS (Atomic Data and Analysis Structure) consortium.
<br>-Fortran 90 compiler
<br>-GNU make utility
<br>-large temporary storage, both in terms of disk space and number of files.