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. 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.
C17.00, release candidate 1, is available for testing. 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.
C13.04, 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 Workshop Summer 2017
The 2017 Cloudy workshops will be in Mexico in early July and in Belfast in early August.
Getting started with Cloudy
The VideoPage has a video 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.
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 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
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