International Reference Ionosphere (IRI) Software
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IMPORTANT: Updates and new versions of the IRI programs will be reported through
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This directory includes the FORTRAN programs and indices of the latest version
of the International Reference Ionosphere model. The source code consist of 54
files and a total volume of 3.3 MByte.
The files can be retrieved by anonymous ftp. An on-the-fly compression
utility can be applied to reduce the size of the files and/or to transfer the
contents of this directory as one single file.
To gzip and transfer one file, please use the following command:
> get filename.gz (e.g. iris13.for.gz)
This will work with the extension '.Z' as well. The tar option can be
used to retrieve a whole subdirectory:
> get subdir.tar
or > get subdir.tar.gz for additional compression.
To unzip and untar these files the following UNIX commands should be used:
> gunzip subdir.tar.gz
and then > tar -xf subdir.tar
Directory Contents:
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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.
irine.for This is a faster, shorter version of IRI that does not include
the new D-region and electron temperature models. It is
especially recommended for computation of ionospheric electron
content. It requires the subroutine files IRIFUN.FOR,
IRITECNE.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.
iritecne.for Special version of iritec.for for use with irine.for
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, 1950, .. 1990,
and 1995 (%%=45, 50, etc.)(ASCII).
igrf00.dat IGRF coefficients for 2000 (ASCII).
igrf00s.dat IGRF coefficients for 2000-2005 (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.
iritestne.for Special version of iritest.for for use with irine.for. Requires
irine, irifun, iritecne, and cira.
inputne.txt Input parameters for a few examples using the iritestne.for program.
outputne.txt Output from the test program for the inputne.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 from 1960 onward
(ASCII).
CCIR%%.ASC Coefficient files for the global representation of F2 peak
URSI%%.ASC peak parameters (foF2, M3000); %% = Month+10 (ASCII). CCIR is
the model recommended by the International Committee Consultative
on Radiocommunication of the International Union of
Telecommunication (ITU). URSI is the model recommended by the
International Union of Radio Science and by the IRI Working Group.
Please consult the 'listing of changes' in the comments section at the top
of these programs for recent corrections and improvements.
More information about the IRI project can be found at
http://nssdc.gsfc.nasa.gov/space/model/ionos/iri.html
IRI parameters can be calculated and plotted online at
http://nssdc.gsfc.nasa.gov/space/models/iri.html
An IRI Newsletter is published quarterly. To be included on the
distribution or to submit articles of IRI-interest please e-mail
to the Newsletter Editor, K. Oyama, at oyama@bochan.ted.isas.ac.jp
An IRI electronic mailer keeps IRI users informed about model and
software updates. To subscribe please send e-mail to
Majordomo@nssdc.gsfc.nasa.gov with the following text in the body of
the message: subscribe iri (use 'unsubscribe iri' later if you want
to remove yourself from the distribution).
------------------------ dieter bilitza ------------------ June 2001