Welcome to the Cloudy home page!
Cloudy is a spectral synthesis code designed to simulate conditions in interstellar matter under a broad range of conditions.
Please post question or problems on the Cloudy discussion board. Updates to Cloudy will be announced on that board.
C13.03, the current Cloudy release, is available. 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. NewC13 explains improvements and changes.
Cloudy Summer School 2014, Winter School 2015
The Cloudy Summer School will be held at Queen's University Belfast, August 18 - 22. This will be similar to the school held in Lexington in 2012 and is intended for participants ranging from little or no experience with Cloudy, to those who want to learn more. The school web site is here. We have hit the enrollment limit so registration is closed.
A second school, in Winter 2015, will be held at Queen's University Belfast, January 12 - 16. The school web site is here. Please join the school news group to be informed when registration opens.
Getting started with 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
More information about Cloudy
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.
The RoadMap page outlines planned future development
Acknowledgments for help with Cloudy are on the AcknowledgmentsPage
Outside pages related to Cloudy or related physics
ContributedMaterial - codes and spectra contributed by others.
A list of typos in AGN3 is posted here. (updated 2007 July 19)
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
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