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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 [wiki:License].
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Please post questions or problems on the Cloudy [discussion board](https://cloudyastrophysics.groups.io).
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Updates to Cloudy will be announced on that board.
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*_Welcome to our new server for nublado.org*_ Our previous host has gone out of business and the U Ky IT group has generously offered their support.
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*_Our user forum has moved to [this groups.io site](https://cloudyastrophysics.groups.io).*_ Yahoo have shut down their old groups site.
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*_C17.02, is released.*_
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[This](https://ui.adsabs.harvard.edu/abs/2017RMxAA..53..385F/abstract) paper discusses what is new.
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Follow the StepByStep instructions for downloading and installing the code,
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or go straight to the DownloadLinks page to obtain it.
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[wiki:NewC17] explains improvements and changes.
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The next *_Cloudy workshop*_ was scheduled for Athens, Greece, June 15-19, 2020 but it delayed due to the virus.
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For more details visit the [ workshop website](http://cloud9.pa.uky.edu/~gary/cloudy/CloudySummerSchool/)
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and join the workshop user group at https://groups.io/g/CloudyAthens2020 to receive notices of developments.
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## Getting started with Cloudy
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The VideoPage has several videos showing how to build and run Cloudy.
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StepByStep instructions for downloading and installing the release version, and running the code on various platforms.
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Or you can go straight to the DownloadLinks page.
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StellarAtmospheres in Cloudy are now very flexible. They are described on this web site rather than in Hazy.
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KnownProblems are described on this page.
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HotFixes are small corrections to the source that fix problems discovered after the current stable version was released.
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The RevisionHistory pages list changes and new features in past, current and the next versions.
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```
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The ReleaseNotes page gives more information about running different versions.
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```
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Frequently asked questions are on the FaqPage
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## More information about Cloudy
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A list of Cloudy papers and documentation can be found [in this link](https://ui.adsabs.harvard.edu/public-libraries/JRuqmRUrSnmRy1U-OR1pRw)
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Old versions of Cloudy are on the CloudyOld page
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The DownloadLinks page gives links to download the current version of the code, and trial versions if they exist.
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Acknowledgments for help with Cloudy are on the AcknowledgmentsPage
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## Outside pages related to Cloudy or related physics
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ContributedMaterial - codes and spectra contributed by others.
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```
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Nick Abel has created a pair of animated gifs showing the time evolution of an H+ region
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with PDR after its ionizing star is turned off and then turned back on.
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The [first](http://www.nublado.org/time_dep_recom.htm) animation shows the cloud recombining and becoming molecular and
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the [second](http://www.nublado.org/time_dep_ioniz.htm) shows the hydrogen ionization front moving across the cloud.
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```
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A list of typos in AGN3 is posted [here](http://cloud9.pa.uky.edu/~gary/AGN3/AGN3typos16-8.pdf). (updated 2016 August)
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A very old page giving [miscellaneous](http://www.ferland.org/cloudy/etcetera.htm) information, including the following:
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people involved in its development, the code's history and style convention,
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computing at Cambridge in the 1970's, what the version numbers mean,
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the distinction between notation such as C+2 vs C III, how to call C from Fortran.
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Software contributed to drive Cloudy, other spectral synthesis codes, development software,
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atomic data, Kentucky, meetings on spectroscopy, and a collection of cloud images from across the internet.
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The web page for the [1994 Lexington meeting](http://www.ferland.org/cloudy/lexington/Lexington.htm) on photoionization and shock models.
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## ScriptsForUsers
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These are donated scripts that help use Cloudy more efficiently.
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Do you have a useful script? If so please send a link to a page describing it to the
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Cloudy [discussion board](https://cloudyastrophysics.groups.io/).
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## DeveloperPages
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## Meta wiki
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Discussion _about_ the wiki, trac, etc is at MetaWiki
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For a complete list of local wiki pages, see TitleIndex.
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The trac page on [wiki formatting](http://trac.edgewall.org/wiki/WikiFormatting)
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---- |
