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Cloudy is a spectral synthesis code designed to simulate conditions in interstellar matter under a broad range of conditions. It is provided for general use under an open source License.
Please post question or problems on the Cloudy discussion board. Updates to Cloudy will be announced on that board.
_C17.01, is released._ This paper discusses what is new. Follow the StepByStep instructions for downloading and installing the code, or go straight to the DownloadLinks page to obtain it. NewC17 explains improvements and changes.
The next _Cloudy workshop_ will be at the University of Kentucky, Lexington, May 20-24, 2019.
For more details visit the workshop website.
The VideoPage has several videos showing how to build and run Cloudy.
StepByStep instructions for downloading and installing the release version, and running the code on various platforms.
Or you can go straight to the DownloadLinks page.
StellarAtmospheres in Cloudy are now very flexible. They are described on this web site rather than in Hazy.
KnownProblems are described on this page.
HotFixes are small corrections to the source that fix problems discovered after the current stable version was released.
The RevisionHistory pages list changes and new features in past, current and the next versions.
The [[ReleaseNotes]] page gives more information about running different versions.
Frequently asked questions are on the FaqPage
A list of Cloudy papers and documentation can be found in this link
Old versions of Cloudy are on the CloudyOld page
The DownloadLinks page gives links to download the current version of the code, and trial versions if they exist.
Acknowledgments for help with Cloudy are on the AcknowledgmentsPage
ContributedMaterial - codes and spectra contributed by others.
Nick Abel has created a pair of animated gifs showing the time evolution of an H+ region
with PDR after its ionizing star is turned off and then turned back on.
The [first](http://www.nublado.org/time_dep_recom.htm) animation shows the cloud recombining and becoming molecular and
the [second](http://www.nublado.org/time_dep_ioniz.htm) shows the hydrogen ionization front moving across the cloud.
A list of typos in AGN3 is posted here. (updated 2016 August)
A very old page giving miscellaneous information, including the following:
people involved in its development, the code's history and style convention,
computing at Cambridge in the 1970's, what the version numbers mean,
the distinction between notation such as C+2 vs C III, how to call C from Fortran.
Software contributed to drive Cloudy, other spectral synthesis codes, development software,
atomic data, Kentucky, meetings on spectroscopy, and a collection of cloud images from across the internet.
These are donated scripts that help use Cloudy more efficiently. Do you have a useful script? If so please send a link to a page describing it to the Cloudy discussion board.
Discussion about the wiki, trac, etc is at MetaWiki
For a complete list of local wiki pages, see TitleIndex.
The trac page on wiki formatting