An Atomic Database for Spectroscopic Diagnostics of Astrophysical Plasmas.

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George Mason University (USA) - University of Michigan (USA) - University of Cambridge (UK) - NASA Goddard Space Flight Center (USA)

CHIANTI consists of a critically evaluated set of up-to-date atomic data, together with user-friendly programs written in Interactive Data Language (IDL) and Python to calculate the spectra from astrophysical plasmas.

The CHIANTI package is freely available.
If you use the package, we only ask you to appropriately acknowledge CHIANTI .

- The Chianti wine-producing area of Tuscany, Italy -

CHIANTI Database Version 9.0 released, March 2019

With Version 9.0, CHIANTI explicitly includes the processes of dielectronic recombination and autoionization. While this does not change the predicted spectrum at low densities, it allow for the exploration of the density sensitivity of some of the satellite lines at high densities. The atomic models for which these changes have been implemented include lithium sequence ions with significant astrophysical abundances and the iron ions Fe XVIII through Fe XXIII.

In addition, existing datasets are updated, new ions added. New total recombination rates for several Fe ions are included and the ionization equilibrium has been recomputed.

A new file type, .auto, contains the autoionization rates fora given ion, such as for Fe XVIII. Consequently, the new database and IDL programs are incompatible with the previous CHIANTI versions and vice-versa. Also, versions 0.8.0 and later of ChiantiPy are required for the new database.

We are grateful to individual scientists and funding agencies for their support.