GSJ Open-file Report, no. 402 Japanese

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.
DatePlace (Assembly)Adoption  Time Span 
Oct., 1968 Washington (IAGA Symp.) 1st Generation: IGRF19651955-1972
Sept., 1973Kyoto (IAGA)    Apply IGRF1965 until 19751955-1975
Sept., 1975Grenoble (IUGG) 2nd Generation: IGRF19751955-1980
Aug., 1981Edinburgh (IAGA) 3rd Generation: IGRF1980
 Notion of DGRF/PGRF: DGRF1965-1975
1965-1985
Aug., 1985Prague (IAGA) 4th Generation: IGRF1985, DGRF1980
 non-definitive models IGRF1945-1960
1945-1990
Aug., 1987Vancouver (IUGG) 5th Generation: definitive models DGRF1945-1960 1945-1990
Aug., 1991Vienna (IUGG) 6th Generation: IGRF1990, DGRF1985 1945-1995
Sept., 1995Boulder (IUGG) 7th Generation: IGRF1995, DGRF1990
 non-definitive models IGRF1900-IGRF1940
1900-2000
July, 1999Birmingham (IUGG) Set up Task Forcedo.
Dec., 1999(Task Force) 8th Generation: IGRF20001900-2005
Aug., 2001Hanoi (IAGA/IASPEI) DGRF1995 and DGRF2000 are to be discussed at Sapporo in 2003 do.
July, 2003Sapporo (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.
FilenameFormatContent
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.fSimple text Source code of FORTRAN subprograms
igrf.cSimple text Source code of C language subprograms
igrf01.coefSimple text Gauss coefficients data for the 1st generation IGRF
igrf02.coefSimple text Gauss coefficients data for the 2nd generation IGRF
igrf03.coefSimple text Gauss coefficients data for the 3rd generation IGRF
igrf04.coefSimple text Gauss coefficients data for the 4th generation IGRF
igrf05.coefSimple text Gauss coefficients data for the 5th generation IGRF
igrf06.coefSimple text Gauss coefficients data for the 6th generation IGRF
igrf07.coefSimple text Gauss coefficients data for the 7th generation IGRF
igrf08.coefSimple text Gauss coefficients data for the 8th generation IGRF
igrf09.coefSimple 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)