Changes from 0.10.0 to 0.11.0

Calculations of the free-bound/radiative recombination continuum and radiation losses depend on a file that provides and LS description of the bound and singly excited energy levels. This file is called c_5.fblvl in the case of C V. Not all ions have an associated .fblvl files and is was necessary to revise ChiantiPy to ignore the free-bound calculation for these ions.

In addition, it was found that under extreme conditions, such as very low temperatures for highly ionized species, that bad values would arise (Nans and infinities). These are now detected and removed.

Changes from 0.9.5 to 0.10.0

The Karzas and Latter (1965) bound-free gaunt factors in the CHIANTI database have been corrected as of CHIANTI version 10. This effects the calculation of the free-bound continuum. The continuum.freeBound method has been updated to uses these new data.

The freeBound and the freeFree methods now have 2 new keyword variables: includeAbund and includeIoneq. Their initial values are True so that elemental abundance and the ionization equilibrium appropriate to the ion is included the the output spectrum.

The freeBoundEmiss is removed as it has become redundant

A new continuum method, freeBoundLossMao includes the radiative-recombination (free-bound) loss rate as calculatd by Mao et al. (2017)

a bug in the inherited method base._IntensityRatio() was corrected.

Changes from 0.9.4 to 0.9.5

this is a bug-fix release.

a bug in the inherited method base._IntensityRatio() had a problem if lines were selected from different ions

Changes from 0.9.3 to 0.9.4

this is a bug-fix release.

changes in version 0.9.2 continued to give problems with ions that included autoionization rates

Changes from 0.9.3 to 0.9.3

this is a bug-fix release.

changes in version 0.9.2 gave problems with ions that included autoionization rates

Changes from 0.9.2 to 0.9.3

this is a bug-fix release.

changes in version 0.9.2 led to an error where ion.recombRate did not work. This has been fixed

Changes from 0.9.1 to 0.9.2

this is a bug-fix release.

changes in version 0.9.1 lead to an error where a bare ion has not recombination rate. This has been fixed

Changes from 0.9.0 to 0.9.1

this is a bug-fix release.

in cases when it is not possible to calculate the free-bound continuum for some ion, mspectrum did not handle this correctly and crashed

also, the ion zn_31 (Zn XXXI) is a bare ion and has no ionization potential (IP) and looking it up caused indexing errors.

Changes from 0.8.7 to 0.9.0

a new module model.maker has been added

import ChiantiPy.model as mdl
mymodel = mdl.maker(...)

a serious bug in ch.freeBound was fixed - the use of a single temperature was problematic

Changes from 0.8.6 to 0.8.7

continued code cleanup

Changes from 0.8.5 to 0.8.6

another bug-fix release

added argCheck method to make sure that sizes of temperature, density and emission measure were compatible

Changes from 0.8.4 to 0.8.5

This is a major bug-fix release.

Errors in calculating the proton rates were corrected.

All temperatures and densities are now numpy arrays

Changes from 0.8.3 to 0.8.4

This is a major bug-fix release.

Another significant bug was fixed in the important ion.populate method.

Changes from 0.7.1 to 0.8.3

This is a major bug-fix release.

a small but mighty bug was found in the important ion.populate method.

Version 0.8.x files are necessary to use with the new CHIANTI Version 9.0 database

Changes have been made to take into account the new way that CHIANTI is handling dielectronic recombination and autoionization

The release is also available on [PyPI](

Documentation is available on [](

and on [ReadTheDocs](

changes from 0.7.1 to 0.8.0

ChiantiPy is now only compliant with Python 3. Development is currently with Python 3.6

The use of the PyQt4 and WxWidgets packages have been dropped and PyQt5 is now used

The documentation is now available on and ReadTheDocs

changes from 0.7.0 to 0.7.1

version 0.7.0 included some changes in the ChiantiPy naming conventions, largely in the continuum class. These are being reverted to the original ChiantiPy naming conventions.

the ion.freeBoundxxx methods have been fixed and this also fixes the problem with the RadLoss class.

a pseudo-voigt filter has been added to tools.filters

the keyword argument wvlRange has been removed from the ion.emiss and ion.intensity methods

the keyword argument for the Emission Measure, em, has been removed from the ion.intensity and similar methods. It is now necessary to specify the emission when the object is instantiated.

a set of PyQt5 dialogs have been developed by ktritz and are now included

this is the last release that will use the PyQt4 widgets as an option.

the method ioneqOne is used by both the Ion and Continuum class. It has been moved to a single file in the base directory

changes from 0.6.5 to 0.7.0

The primary change is that code developement has been moved to Github.

Also, in order to be more compliant with other astrophysical packages on Github (Astropy and SunPy) the directory layout has been changed and renamed.

The core routines are now imported as

import ChiantiPy.core as ch

this give access to ch.ion, ch.spectrum, etc.

In terms of bug-fixes, the calculation of excitation-autoionization cross-sections and rates have been corrected in the eaCross() and eaRate() methods

Current development is with Python 3.4

changes from 0.6.0 to 0.6.5

matplotlib.pyplot is now imported for plotting

IPython version 4 / Jupyter is now listed as a prerequisite. However, v0.6.4 can be made compatible with IPython 2 or 3 with a simple edit.

An error in calculating the proton excitation rates was fixed.

The code has been edited to make it compatible with Python 3 and has been tested against Python 3.3

changes from 0.5.3 to 0.6.0

This is a major release.

First, ChiantiPy 0.6.0 is compatible with the most recently released CHIANTI database version 8.0. It also fixes some major bugs in the previous version. Documentation has been improved and a IPython notebook QuickStart.ipynb, that largely follows the ‘Quick Start’ documentation pages, has also been included.

There are two new multi-ion classes: bunch and ipymspectrum. bunch allows the user to calculate line intensities for a specified set of elements or individual ions as a function of temperature or density. One advantage of bunch is the ability to calculate the intensity ratio of lines of two different ions as a function of temperature or density.

ipymspectrum is much like the existing spectrum and mspectrum classes. mspectrum allows the use of the Python multiprocessing module to speed up spectral calculations. The ipymspectrum class uses the IPython parallel module so that multiprocessing spectral calculations can be performed in the IPython QtConsole and Notebook.

A new method intensityList has been developed to allow the user to list the most intense lines within a given wavelength range. This new methods, together with previously existing intensityRatio and intensityRatioSave are all now inherited by the ion classs and the multi-ion classes.

The ion and multi-ion classes now accept the keyword argument abundanceName that allow the user to specify the set of elemental abundances rather than just the default abundance file.

Additional we have replaced the FortranFormat module of Scientific Python by Konrad Hinsen with the fortranformat module of Brendan Arnold at I have slightly modified fortranformat to make it Python 3 compliant.

For the future, I plan to make ChiantiPy compliant with both Python 2.7 and the current version of Python 3 (now 3.4), improve the documentation and move the projec to github, in no particular order.

ChiantiPy is now released under a new license, the OSI approved ISCL license. From Wikipedia The ISCL license is a permissive free software license written by the Internet Software Consortium (ISC). It is functionally equivalent to the simplified BSD and MIT/Expat licenses, …