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Cloudy & Associates

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Last edited by Gunasekera, Chamani M. 6 months ago

--------------------------------------------------------------------------------

Cloudy's simulation of the outer region of the Perseus galaxy cluster. The
figure shows resolved fine-structure one-electron doublets such as Fe XXVI. A
spectral resolution of R = 0.25 eV and a log column density of 24 were used.
J-splitting of the one-electron nP - 1S lines is a major improvement in the
upcoming 2024 release of Cloudy, as described in the upcoming Gunasekera+2024

--------------------------------------------------------------------------------

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.

Cloudy is Nature Astronomy’s first Code of Honour! Their editorial announcing
their Access Code series is here. Their interview on the origins and future of
Cloudy is here.

Please post questions or problems on the Cloudy user forum. Updates to Cloudy
will be announced on that board.

C23.01 is released. This paper discusses the major bug fixed in C23.01, which
affects dusty environments. This paper discusses what is new in C23. Follow the
StepByStep instructions for downloading and installing the code, or go straight
to the DownloadLinks page to obtain it. NewC23 explains improvements and
changes.


UPCOMING CLOUDY WORKSHOP

Aug 5th - Aug 9th, at ISAS, Japan. More details here.


GETTING STARTED WITH CLOUDY

The Videos showing how to build and run Cloudy page has several useful videos.

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 about Cloudy


MORE INFORMATION ABOUT CLOUDY

A list of Cloudy papers and documentation can be found in this link.


CLOUDY'S CITATION RATE (UPDATED WEEKLY). (THE CURRENT YEAR IS INCOMPLETE.)



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.


OUTSIDE PAGES RELATED TO CLOUDY OR RELATED PHYSICS

ContributedMaterial - codes and spectra contributed by others.

Nick Abel used Cloudy to create a pair of animated gifs showing the time
evolution of an H+ region with PDR after its ionizing star is turned on and then
turned off. The first shows an advancing ionization front with the H+ layer
moving from left to right into the atomic and molecular regions. The second
shows the recombining cloud starting out ionized, becoming atomic, and
eventually molecular.

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.

The web page for the 1994 Lexington meeting on photoionization and shock models.
This meeting was the first of a pair of meetings celebrating Mike Seaton's and
Don Osterbrock's 70th birthdays. A book was published by Bob Williams and
sometime later I posted the summary chapter describing our meeting.

The web page for the 1998 Quasar Luminosity on using quasars as standard candles
for cosmology. The ADS link to the ASP Conference Series book Jack Baldwin and I
did is here.

A meeting I organized on magnetic fields in the ISM here at UK in honor of Tom
Troland's 60th birthday.

My notes on converting Cloudy from Fortran 77 to C. I published a conference
paper on the experience.


SCRIPTSFORUSERS

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.


DEVELOPERPAGES

These developer's notes pages summarize our notes on developing Cloudy. You are
most welcome to help.

--------------------------------------------------------------------------------

On this page
 * Upcoming Cloudy Workshop
 * Getting started with Cloudy
 * More information about Cloudy
   * Cloudy's citation rate (updated weekly). (The current year is incomplete.)
 * Outside pages related to Cloudy or related physics
 * ScriptsForUsers
 * DeveloperPages


PAGES

167
   
 * AcknowledgmentsPage
 * AgendaThailand
 * AssertTrapping
 * AstroSeminar
 * AtomicMolecularData
 * ChiantiData
 * CloudyNews
 * CloudyOld
 * CloudyPapers
 * CloudySubversion
 * CloudySummitAthens
 * CloudySummitBelfast
 * CloudySummitBelfast14
 * CloudySummitBrussels
 * CloudySummitDurham
 * CloudySummitImperial
 * CloudySummitMexico16
 * CodeAnalysisTools
 * CompileCode
 * CompileStars
 * CompilingcCloudy
 * CompilingCloudy
 * CompilingCloudyC07
 * CompilingCloudyC08
 * CompilingCloudyC10
 * CompilingCloudyC13
 * CompilingCloudyC15
 * CompilingCloudyC16
 * CompilingCloudyC17
 * CompilingCloudyNext
 * CompilingCloudyOSX
 * CompilingSMP
 * CompilingWindows10
 * ContributedMaterial
 * CoolingGas
 * CountDown
 * CssPrototyping
 * DataBase
 * DataBaseFormatBelfast
 * DataParser
 * DeveloperPages
 * Developing With Eclipse
 * Developing with Visual Studio
 * DevelopingInMPI
 * DevelopingWithBcx
 * DevelopingWithClangLLVM
 * DevelopingWithCloud
 * DevelopingWithDlx
 * DevelopingWithGcc
 * DevelopingWithGitAndHg
 * DevelopingWithIcc
 * DevelopingWithNetBeans
 * DevelopingWithRadegund
 * DevelopingWithValgrind
 * DevelopingWithWindows
 * DevelopingWithXcode
 * DownLoad
 * DownloadLinks
 * DustContinuum
 * EditPath
 * EmacsSettings
 * EmissionLineStructure
 * EmLine
 * Frequently asked Questions about Cloudy
 * Gary's Markdown Notes
 * GarysNotes
 * GoldVersionToDo
 * GroupPapers
 * HazyOutputFormats
 * HazyTwo
 * HierarchicalPhysics
 * Home
 * HotFixes
 * HotFixes_05_07
 * HotFixes_06_02
 * HotFixes_07_02
 * HotFixes_08
 * HotFixes_10
 * HotFixes_13
 * HotFixes_17
 * HotFixToDo
 * InputParser
 * IntrincisEmergent
 * JobOpenings
 * KnownProblems
 * KnownProblems_05_07
 * KnownProblems_06_02
 * KnownProblems_07_02
 * KnownProblems_08
 * KnownProblems_10
 * KnownProblems_13
 * KnownProblems_17
 * License
 * MagicNumbers
 * MakefileDescription
 * MakeFileDeveloping
 * MakingContributions
 * MergeToMaster
 * MoleCoReactions
 * MpiParallel
 * MpiParallelC13
 * MpiParallelC17
 * MultiArr
 * MultiArrPage
 * NewC05.07
 * NewC06.02
 * NewC07.02
 * NewC08
 * NewC10
 * NewC13
 * NewC17
 * NewC22
 * NewC23
 * NewC84
 * NewC90
 * NewC94
 * NewC96
 * NewMole
 * NewMoleNickObservations
 * NewOlder
 * NewOnThisSite
 * NewSiteNavigation
 * NextRelease
 * NLTE7
 * OutputOptions
 * Parallelization
 * PatchFiles
 * Performance
 * prototype minimal instructions for building Cloudy
 * ReleaseNotesC13
 * RemoveHeaders
 * ReviewPaper
 * RevisionHistory
 * RoadMap
 * RunCode
 * RunningC10
 * RunningC13
 * RunningC15
 * RunningC17
 * RunningC22
 * RunningC23
 * SakuraiObject
 * SaveState
 * ScriptsForUsers
 * SharingBibliography
 * Smoke Test
 * SolarAbundances
 * StellaratmosphereOld
 * StellarAtmospheres
 * StepByStep
 * Stout
 * StoutData
 * StylePage
 * SubversionPage
 * SummerSchool
 * SupportLibraries
 * TestFramework
 * TestSuite
 * ToDoList
 * UnitTesting
 * UnitTests
 * uploads
   * 7621bc079e3af55605ff5e1ba0544ea8
     * mole_co_reactions
 * VectorMathRoutines
 * VersionNumbers
 * Videos showing how to build and run Cloudy
 * WorkshopAgenda
   View all pages

Photoionization simulations since 1978