Calculation of the International Geomagnetic Reference Field (3)
Tadashi Nakatsuka (Institute of Geoscience, GSJ/AIST)
Abstract
International Geomagnetic Reference Field (IGRF) is a mathematical model
of the geomagnetic field originating from the Earth's interior, and it is
adopted at the meeting of the International Association of Geomagnetism and
Aeronomy (IAGA).
This Open-file Report is a revised version for the former report with same
title (GSJ Open-file Report, no. 184, 1992).
The description on the adoption of new IGRF models since 1995 (until 2003)
is added and the FORTRN source code is updated to cover the newer model
calculation. The C language subprogram is also presented.
The history of the adoption of IGRF models are summarized as follows.
Date | Place (Assembly) | Adoption |
Time Span |
Oct., 1968 |
Washington (IAGA Symp.) |
1st Generation: IGRF1965 | 1955-1972 |
Sept., 1973 | Kyoto (IAGA) |
Apply IGRF1965 until 1975 | 1955-1975 |
Sept., 1975 | Grenoble (IUGG) |
2nd Generation: IGRF1975 | 1955-1980 |
Aug., 1981 | Edinburgh (IAGA) |
3rd Generation: IGRF1980
Notion of DGRF/PGRF: DGRF1965-1975 | 1965-1985 |
Aug., 1985 | Prague (IAGA) |
4th Generation: IGRF1985, DGRF1980
non-definitive models IGRF1945-1960 | 1945-1990 |
Aug., 1987 | Vancouver (IUGG) |
5th Generation: definitive models DGRF1945-1960 |
1945-1990 |
Aug., 1991 | Vienna (IUGG) |
6th Generation: IGRF1990, DGRF1985 |
1945-1995 |
Sept., 1995 | Boulder (IUGG) |
7th Generation: IGRF1995, DGRF1990
non-definitive models IGRF1900-IGRF1940 |
1900-2000 |
July, 1999 | Birmingham (IUGG) |
Set up Task Force | do. |
Dec., 1999 | (Task Force) |
8th Generation: IGRF2000 | 1900-2005 |
Aug., 2001 | Hanoi (IAGA/IASPEI) |
DGRF1995 and DGRF2000 are to be discussed at Sapporo in 2003 |
do. |
July, 2003 | Sapporo (IUGG) |
9th Generation: DGRF1995, DGRF2000
Notation by generation (e.g., IGRF-8 1997.5) |
1900-2005 |
The text of this report in Japanese consists of the following sections.
1. Introduction
2. Outline of IGRF, its history of adoption
3. Basic formulation for IGRF
4. Algorithm of calculation
5. Function of subprograms presented
6. Brief explanation for the subprograms
7. How to use (example)
References
Appendix-1. Source list of FORTRAN subprograms
Appendix-2. Source list of C language subprogram
Appendix-3. Contents of attached diskette
Following files are included in this Open-file Report.
Filename | Format | Content |
igrf.3a.doc |
MS Word Document (in Japanese) |
Body text of this Open-file Report (Former half, pp. 0-15) |
igrf.3b.doc |
MS Word Document (in Japanese) |
Appendices of this Open-file Report (Latter half, pp. 16-39) |
igrf.f | Simple text |
Source code of FORTRAN subprograms |
igrf.c | Simple text |
Source code of C language subprograms |
igrf01.coef | Simple text |
Gauss coefficients data for the 1st generation IGRF |
igrf02.coef | Simple text |
Gauss coefficients data for the 2nd generation IGRF |
igrf03.coef | Simple text |
Gauss coefficients data for the 3rd generation IGRF |
igrf04.coef | Simple text |
Gauss coefficients data for the 4th generation IGRF |
igrf05.coef | Simple text |
Gauss coefficients data for the 5th generation IGRF |
igrf06.coef | Simple text |
Gauss coefficients data for the 6th generation IGRF |
igrf07.coef | Simple text |
Gauss coefficients data for the 7th generation IGRF |
igrf08.coef | Simple text |
Gauss coefficients data for the 8th generation IGRF |
igrf09.coef | Simple text |
Gauss coefficients data for the 9th generation IGRF |
index.html |
HTML Document (in English) |
English abstract of this Open-file Report (This document) |
indexJ.html |
HTML Document (in Japanese) |
Japanese abstract of this Open-file Report |
References (in chronological order)
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Spherical harmonic analysis in geophysics.
Geomagnetism, vol.2, 606-638. Oxford Univ. Press, New York.
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Proceedings of the Twelfth General Assembly, Hanburg, Germany.
Trans. IAU, 12B, 594-595.
- IAGA Commision 2 Working Group No.4, Analysis of the Geomagnetic Field
(1969) The International Geomagnetic Reference Field 1965.0,
J. Geomag. Geoelectr., 21, 569-571;
J. Geophys. Res., 74, 4407-4408.
- International Association of Geomagnetism and Aeronomy (IAGA) (1973)
Transactions of the Second General Scientific Assembly, Kyoto, Japan.
IAGA Bull., no.35, 147, Resolution 18.
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International Geomagnetic Reference Field 1975,
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Eos Trans. AGU, 57, 120-121 (1976);
J. Geophys. Res., 81, 5163-5164 (1976);
Geophys. J. Roy. Astron. Soc., 44, 733-734 (1976).
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a report by IAGA Division I Working Group 1,
J. Geomag. Geoelectr., 33, 607-611;
Geophys. J. Roy. Astron. Soc., 68, 265-268 (1982);
Geophysics, 47, 841-842 (1982).
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the third generation,
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Geophisics, 48, 1691-1696.
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Calculation of the International Geomagnetic Reference Field.
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Calculation of the International Geomagnetic Reference Field (2).
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The 9th Generation International Geomagnetic Reference Field,
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