Calculation of the International Geomagnetic Reference Field (5)
Tadashi Nakatsuka
(Institute of Geology and Geoinformation, GSJ/AIST)
Abstract
International Geomagnetic Reference Field (IGRF) is a mathematical
model of the geomagnetic field originating from the Earth's interior,
and it has been adopted at the meeting of the International Association of
Geomagnetism and Aeronomy (IAGA).
This Open-File Report has been revised as follows.
(5) | GSJ Open-File Report, no.614 (this issue) |
2015 | Follow up IGRF-12 generation. Updated C source code
with improved calculation accuracy in polar regions.
(CD-ROM disk) |
(4) | GSJ Open-File Report, no.423
|
2005 | Follow up IGRF-10 generation, WGS84 ellipsoid.
(3.5" diskette) |
(3) | GSJ Open-File Report, no.402 | 2004 |
Follow up 1992 - 2003 revisions of IGRF models.
Program update for calculating by generation number,
also with C language source. (3.5" diskette) |
(2) | GSJ Open-File Report, no.184 | 1992 |
Follow up 1987 - 1991 revisions of IGRF models.
Stored in an electronic media. (5" diskette) |
(1) | GSJ Open-File Report, no.27 | 1986 |
1st edition. Explanation of IGRF adoption history till 1985.
FORTRAN code for IGRF calculation. (only on sheet paper) |
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: IGRF-9 (DGRF1995, DGRF2000,
predictive secular term)
Notation by generation (e.g., IGRF-8 1997.5) |
1900-2005 |
Dec., 2004 | (Task Force) |
10th Generation: IGRF-10 | 1900-2010 |
Dec., 2009 | (Task Force) |
11th Generation: IGRF-11 | 1900-2015 |
Dec., 2014 | (Task Force) |
12th Generation: IGRF-12 | 1900-2020 |
The text of this report consists of the following sections
in Japanese.
1. Introduction
2. Outline of IGRF - its history of adoption
3. Basic formulation for IGRF
4. Algorithm of calculation
5. Functions of the subprogram presented
6. Supplemental information on the subprogram
7. How to use (example)
References (in chronological order)
List of content in appended CD-ROM media
List of content in appended CD-ROM media.
References (in chronological order)
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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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