International Reference Ionosphere 2007 (IRI2007) Software ---------------------------------------------------------- ================================================================================ IMPORTANT: Updates and new versions of the IRI programs will be reported through the IRInfo electronic mailer distribution. To subscribe send e-mail to Majordomo@nssdc.gsfc.nasa.gov with the following text in the body of the message: subscribe iri (use 'unsubscribe' to remove yourself from the list) ================================================================================ The IRI is a joined project of the Committee on Space Research (COSPAR) and the International Union of Radio Science (URSI). IRI is an empirical model specifying monthly averages of electron density, ion composition, electron temperature, and ion temperature in the altitude range from 50 km to 1500 km. This directory includes the FORTRAN program, coefficients, and indices files for the latest version of the International Reference Ionosphere model: IRI2007. This version includes several options for different parts and parameters. A logical array JF(30) is used to set these options. The IRI-recommended set of options can be found in the COMMENT section at the beginning of IRISUB.FOR. IRITEST.FOR sets these options as the default. The compilation/link command in Fortran 77 is: f77 -o iri iritest.for irisub.for irifun.for iritec.for iridreg.for igrf.for cira.for ================================================================================ IMPORTANT: Please note that the following files have NOT been changed and are the same as for IRI2001: CCIR%%, URSI%%, DGRF45-DGRF95, ================================================================================ Directory Contents: ----------------------------------------------------------------------------------- 00_iri2007.tar TAR file that includes all files from this directory. Was created in UNIX using 'tar -cvf 00_iri2007.tar *'. UNIX command to unpack is "tar -xvf 00_iri2007.tar". irisub.for This file contains the main subroutine iri_sub. It computes height profiles if IRI output parameters (Ne, Te, Ti, Ni, vi) for specified date and location. Also included is the subroutine iri_web that computes output parameters versus latitude, longitude (geog. or geom.), year, day of year, hour (LT or UT), and month. An example of how to call and use iri_web is shown in iritest.for. Compilation of iritest.for requires irisub.for, irifun.for, iritec.for, iridreg.for, igrf.for, and cira.for. irifun.for This file contains the subroutines and functions that are required for running IRI. iridreg.for Subroutines for the D region models of Friedrich-Torkar and of Danilov et al. iritec.for This file includes the subroutines for computing the ionospheric electron content from 60km up to a specified upper limit. cira.for This file includes the subroutines and functions for computing the COSPAR International Reference Ionosphere 1986 (CIRA-86) neutral temperature. igrf.for This file includes the subroutines for the International Geomagnetic Reference Field (IGRF). dgrf%%.dat Definitive IGRF coefficients for the years 1945 to 2000 in steps of 5 years (%%=45, 50, etc.)(ASCII). igrf05.dat IGRF coefficients for 2005 (ASCII). igrf05s.dat IGRF coefficients for 2005-2010 (ASCII). iritest.for Test program indicating how to use of the IRI subroutines. Requires irisub, irifun, iritec, iridreg, igrf,and cira. input.txt Input parameters for a few examples using the iritest.for program. output.txt Output from the test program for the input.txt input parameters. ig_rz.dat This file contains the solar and ionospheric indices (IG12, Rz12) for the time period from Jan 1958 onward. The file is updated quarterly. It is read by subroutine tcon in irifun.for (ASCII). ap.dat This file provides the 3-hour ap magnetic index and F10.7 daily index from 1960 onward (ASCII). CCIR%%.ASC, Coefficient files for the global representation of the F2 peak URSI%%.ASC peak parameters (foF2, M3000) where %% = Month+10 (ASCII). CCIR is the model recommended by the International Committee Consultative on Radiocommunication (CCIR) of the International Union of Telecommunication (ITU). URSI is the model recommended by the International Union of Radio Science. IRI recommends the CCIR model for the continents and the URSI model for the ocean areas. If a single model is needed globally URSI is recommended. Stand-alone Programs: IMAZ The Ionospheric model for the Auroral Zone (IMAZ) specifies the electron density in the auroral E-region using a NeuralNet approach and expecting as input (auroral) latitude, longitude, year, day of year, hour, 3-hourly Ap, daily F10.7, and riometer absoprtion as an optional input if available. Consist of the following files iri_imaz.for, imaztest.for, chapman.prn, press_60deg.txt, press_70deg.txt, and 00readme_imaz.txt. akebono_te.for Model for the plasmspheric electron temperature based on Akebono measurements. The file includes the model subroutines and coefficients and a simple driver program to illustrate its usage. NOTE: Please consult the 'listing of changes' in the comments section at the top of each one of these programs for recent corrections and improvements. ----------------------------------------------------------------------------------- More information about the IRI project can be found at http://IRI.gsfc.nasa.gov ----------------------------------------------------------------------------------- IRI parameters can be calculated and plotted online at http://modelweb.gsfc.nasa.gov/models/iri.html --------------------------------------- dieter bilitza ------------------ May 2007