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This page summarizes all major changes and improvements to Cloudy that will be included in the next release. You may also view the HotFixes and KnownProblems pages, or return to the main RevisionHistory page.

· 67 August 1987. Hydrogen atom goes to LTE in limit of large electron densities. Many small bugs uncovered as result of careful comparison with Netzer's ION.

· 68 Cambridge, Fall 1987. Development work in progress.

· 69 December 1987. Hydrogen atom goes to LTE in limit of large photon densities. Ferland and Rees (1988).

· 70 September 1988. He II transfer improved. Improved form of escape probabilities with explicit damping constants. H- and improved free-free heating. Many high excitation metal lines transferred. (Rees, Netzer, and Ferland 1989; Ferland and Persson 1989).

· 71 December 1988. Photon array rewritten, now Compton exchange problem is exact for black bodies with temperatures between 2.7 K and 1010 K. He II a radiation pressure included.

· 72 January 1989. Static version, minor bug fixes.

· 73 1989. Major rewrite of helium treatment. Dust changed to two populations, scattering and absorption included. Default radius and thickness increased by ten orders of magnitude. He+ goes to LTE. Development work on getting helium to go to LTE. IR power law for default AGN continuum now SYMBOL 110 \f "Symbol"+2.5 below 100 micron break. No anumm array, all continuum one array. table star. coolr broken up. Helium to LTE for high electron density.

· 74 1990 January. Hydrogen double precision, many bug fixes. 10 tables among the continua. Kurucz (1989) atmospheres. Improved dust treatment, including photoionization and charge.

· 75 1990, JILA visit. Cosmic abundances changed to Grevesse and Anders. Major bug in constant pressure for HII regions, PNs, etc; did not affect BLR. Calculation of ) was incorrect. Molecules at low temperatures. HDEN now n(Ho) + n(H+) + n(H-) + 2n(H2) + 2n(H2+). Improved Rayleigh scattering treatment. Dielectronic recombination for sulfur (guess). Many changes in dust; Orion paper (Baldwin et al. 1990). Subordinate lines changed to Hummer’s K2 function.

· 76 1990, static version from end of JILA visit.

· 77 through Nov. 1990. optimize option added using Bob Carswell's code. Gaunt factor for brems input spectrum. Reflected continuum predicted. Frequency partition adjusted. X-Ray optical depth now at 0.5 keV. Read in table of points from previous calculation. opsav deleted, now single pointer opsv for all opacities. Numerical array to 100 MeV. Hummer La escape destruction prob. tautot arrays now both in and outward directions. Bound Compton included for all ionization levels. Mean ionization arrays rewritten to make sense. Bug in wind velocity fixed, result now exact. C, O outward diffuse fields changed to OTS.

· 78 through May 91. Continuum escape probability formal H-only opacity. H recombination, cooling over wide range of temp. X-Ray optical depth back to 1 keV. abundances no dust no longer changes abundances of depleted elements. OI treatment is now six-level atom. Default table AGN changed. Continuum normalization rewritten. Milne relation for diffuse fields of H, all He. Fe Ka divided into hot and cold. Beams paper (Ferland, Peterson, Horne, et al. 1992) Many high ionization lines included as OTS and outward ionization sources.

· 79 Summer 91. H molecules completed, C, N, O molecules included. Continuum binning changed for Ca, Fe L-shell ionization potentials. Extensive testing.

· 80 July 91, static version .05. Version 80.06 fixed many small problems discovered by several people. New collision strength for [NeV] put in. This static version ended with 80.09, in January of 1993.

· 81 Late 1991. New collision strengths for [NeV] IR lines (10x larger). Also for [CII], [NIII], and [OIV]. Some are 2x larger. Opacity arrays totally rewritten with eye to Opacity Project data. NIII paper (Ferland 1992).

· 82 Early 1992. X-Ray opacity arrays rewritten. Improved pressure convergence. HJBAR now function. Error in cooling due to collisional ionization of H, He. Sodium and nickel added. /TAU/ array broken up. All heavy element opacities converted to table look-up. Revised collision strengths for NIII lines, improved treatment of atom. NLR abundances deleted, ISM put in their place. Summary comments now driven by subroutine. Cap on 911 OTS field. Note on [FeXI] maser (Ferland 1993). Luminosity command separated into luminosity and intensity commands.

· 83 Autumn 1992, Cambridge and CTIO visits. Hydrogen molecule network completed, Ferland, Fabian, and Johnstone (1993). Collision strengths for fine structure lines changed to Blum and Pradhan 1992, Hollenbach and McKee 89; these changed temperatures for cold ISM by factors of 2. Heavy element molecule network as in Hollenbach and McKee 1989. Code works in fully molecular limit. Kevin Volk’s stars (Atlas 91, and Werner models). More accurate treatment of secondary ionization after Voit visit. [OI] lines each include escape prob. Opacities, destruction probabilities, evaluated within all loops, code far more stable, but roughly three times slower. Transferred HeI 2.06 line correctly, after Shields papers.

· 84 1993 Feb 13, Static version following CTIO visit.

· 85 1994, Revisions following Lexington meeting. Outward only now default continuum transport.

· 86 1995, All of first thirty elements are now in code. Photoionization database changed to Dima Verner’s phfit.

· 87 1995 summer, Map now converges electron densities. Negative populations of OI and FeII atoms solved. Dima’s 6k lines included in cooling and radiative acceleration. Total rewrite of nextdr logic. Ionization predictor corrector logic completely rewritten. Dima’s phfit now fitted to all Opacity Project data.

· 88 1995 Fall-winter. Kirk’s extensive grids of BLR models run. March 1996 visit to Tel Aviv to compare results with Hagai. Kirk carefully went over atomic data base. Iron recombination changed to Arnaud and Raymond (1992). Default iron abundance down 33%. Entire line data base revised.

· 89 1995 winter-spring. These were mainly beta versions with no major changes, but many fixes to problems.

· 90 1996 June 17, static version, extensive year of debugging. Ferland et al. (C90) paper.

· 91 1977, preparation of C version.

· 92 1998, sabbatical at CITA, revision and debugging of C version.

· 94 1999 December 24, gold version of C code.

· 96 2003 January, He isoelectronic sequence, CO multilevel molecule, pgrains distributed grains, atomic data update, H2 molecule.

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