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Project : CHIANTI CHIANTI is an atomic database package for the calculation of continuum and emission line spectra from astrophysical plasmas. It is a collaborative project involving the Naval Research Laboratory (Washington DC, USA), the Arcetri Observatory (Firenze, Italy), and the Cambridge University (United Kingdom). Name : USE_CHIANTI Purpose : Sets up system variables for use of CHIANTI routines Explanation : The CHIANTI software uses system variables that have to be defined. This routine is called by the CHIANTI routines if these system variables are not defined. ** If one is using the solar-soft package, these should already be defined*****. ** If the CHIANTI package is used as stand-alone, then this routine can be used for the setup with e.g.: use_chianti,'/home/data/chianti/' if /home/data/chianti/ points to the actual place where the CHIANTI top directory is. Use : IDL> use_chianti, '/home/data/chianti/', $ [ioneq= , abund=] Inputs : None Opt. Inputs : The full pathname of the CHIANTI top directory. Outputs : None Opt. Outputs: None Keywords : IONEQ - to define the default ionization eq. file to be used. ABUND - to define the default abundance file to be used. Calls : None Common : None Restrictions: None Side effects: None Category : Prev. Hist. : Based on use_dere_chianti, written by C D Pike, RAL Written : Giulio Del Zanna (GDZ) DAMTP (University of Cambridge, UK) Modified : Version 1, GDZ 10-Oct-2000 Version 2, GDZ 10-Jan-2001 added the definition of the !abund_file V. 3, GDZ, 2-May-2002 Modified substantially, adding a new system variable. V.4, 10-July-2002 GDZ Removed the definition of !chianti_top, upon request. V.5, 25-July-2002, GDZ Fixed a problem with IDL versions earlier than 5.3 (the routine would not compile). ALso, introduced the use of concat_dir for cross-platform compatibility. V.6, 06-Aug-02 GDZ Changed the use of CHIANTI system variables. Added comments on the which CHIANTI version is used. V.7 12-Aug-02 GDZ Changed default abundance file. Removed '***' V.8, GDZ 13-Feb-2003 Changed default ioneq file, to include ALL the elements. V.9, 12-Aug-2005, GDZ Changed default ioneq file from mazzotta_etal_ext to mazzotta_etal_9.ioneq where ion fractions have been extended up to 10^9 K. This is useful to avoid steps in the emissivities at high-temperatures. V.10, 19-Sept-2005, GDZ made last version backward-compatible. v.11, 3-Jun-2009, GDZ made the new v.6 ioneq the default. Version : V.11, 3-Jun-2009