/[PAMELA software]/yodaUtility/igrf/00README.TXT
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Software for geomagnetic field calculation. The validity time interval is 2000-2010.

1 kusanagi 1.1 =========================================================================
2     National Space Science Data Center Data set MG-14G
3     =========================================================================
4    
5     NAME: International Geomagnetic Reference Field - 10th Generation
6    
7     SOURCE:
8    
9     Susan Macmillan
10     British Geological Survey
11     West Mains Road
12     Edinburgh EH9 3LA, UK
13     Tel: +44 131 650 0228
14     Fax: +44 131 668 4368
15     email: smac@bgs.ac.uk
16    
17     Stefan Maus
18     Colorado Institute for Research in the Environmental Sciences
19     National Geophysical Data Center
20     325 Broadway
21     Boulder, CO 80305-3328 USA
22     Tel: +1 303 497 6522
23     Fax: +1 303 497 6513
24    
25     NSSDC CONTACT:
26     D. Bilitza,
27     GSFC/NSSDC
28     code 633/Raytheon,
29     Greenbelt, MD 20771,
30     Fax. (301) 286-1771
31     bilitza@mail630.gsfc.nasa.gov
32    
33     CONTENT:
34     this file AAREADME.DOC
35     FORTRAN source code:
36     main program (interactive driver) BILCAL.FOR
37     subroutines, functions SHELLIG.FOR
38     BILCAL user manual with examples BILCAL.LOG
39     All in one subroutine igrf_sub.for
40     This file includes SHELLIG.FOR and also a subroutine
41     igrf_sub that computes IGRF parameters.
42    
43     geomagnetic field model coefficients:
44     for 1945 DGRF45.DAT
45     for 1950 DGRF50.DAT
46     for 1955 DGRF55.DAT
47     for 1960 DGRF60.DAT
48     for 1965 DGRF65.DAT
49     for 1970 DGRF70.DAT
50     for 1975 DGRF75.DAT
51     for 1980 DGRF80.DAT
52     for 1985 DGRF85.DAT
53     for 1990 DGRF90.DAT
54     for 1995 DGRF95.DAT
55     for 2000 DGRF00.DAT+
56     for 2005 IGRF05.DAT+
57     extrapol. coeff. for 2005-2010 IGRF05S.DAT
58    
59     + The original IGRF files include coefficients up to order 13. We only use
60     coefficients up to order 10 like in the earlier model generations. The full
61     set of coeffients is in files IGRF00full.DAT and DGRF05full.DAT. Use of the
62     full set requires changes to the software.
63    
64     BRIEF DESCRIPTION:
65    
66     The International Geomagnetic Reference Field (IGRF) model is the
67     empirical representation of the Earth's magnetic field recommended for
68     scientific use by the International Association of Geomagnetism and
69     Aeronomy (IAGA). The IGRF model represents the main (core) field without
70     external sources. They employ the usual spherical harmonics expansion
71     of the scalar potential in geocentric coordinates. The IGRF model
72     coefficients are based on all available data sources including geomagnetic
73     measurements from observatories, ships, aircrafts and satellites.
74    
75     The model consists of coefficient sets from epoch 1945 onward in steps
76     of 5 years and the first time derivatives of the coefficients for a 5-year
77     extrapolation into the future. During the 5-year intervals between consecutive
78     models, linear interpolation is recommended. The IGRF homepage provides access
79     to coefficient files back to 1900. The files up to 1995 provide coefficients
80     up to order 10, for 2000 and 2005 coefficients up to order 13 are provided.
81     Our calculations are limited to using coefficients up to order 10 for all
82     files.
83    
84     In combination with the IGRF coefficient sets different subroutines have
85     been used to determine the components of the magnetic field vector and the
86     L-value at a given location. The NSSDC version uses the subroutines FELDG
87     (magnetic field vector) and SHELLG (L shell) developed by G. Kluge at the
88     European Space Operations Center (ESOC). His use of inverse cartesian co-
89     ordinates simplifies the computation. The IGRF subroutines were developed
90     by A. Zunde of the U.S. Geological Survey (USGS).
91    
92     The program BILCAL produces tables of the geomagnetic field strength, vector
93     components (B-abs., B-north, B-east, B-down, declination, inclination),
94     equatorial/minimum field strength (B0), dipole moment, and L-value in
95     latitude, longitude (geodetic), altitude, or year (decimal).
96    
97     Before using the IGRF please read the 'Health Warning' at
98     http://www.ngdc.noaa.gov/IAGA/wg8/igrfhw.html
99    
100     AVAILABILITY:
101     (1) FORTRAN source code from this directory.
102     (2) Model parameters can be computed and plotted online on IGRFWeb at http://nssdc.gsfc.nasa.gov/space/model/ .
103     (3) Model homepage at http://www.ngdc.noaa.gov/IAGA/wg8/wg8.html .
104    
105     REFERENCES:
106    
107     Peddie, N. W., International Geomagnetic Reference Field: the third
108     generation, J. Geomagn. Geoelectr. 34, 309-326, 1982.
109    
110     Kluge, G., Direct computation of the magnetic shell parameter,
111     Computer Phys. Communications 3, 31-35, 1972.
112    
113     International Geomagnetic Reference Field Revision 1987, J. Geomag.
114     Geoelectr. 39, 773-779, 1987 and EOS Trans. 69, 559, 1988
115    
116     Langel, R. A., D. R. Barraclough, D. J. Kerridge, V. P. Golovkov,
117     T. J. Sabaka, and R. H. Estes, Definitive IGRF models for 1945,
118     1950, 1955, and 1960, J. Geomag. Geoelectr. 40, 645-702, 1988
119    
120     Langel, R. A., International Geomagnetic Reference Field, 1991
121     Revision, J. Geomag. Geoelectr. 43, 1007-1012, 1991
122    
123     Barton, C.E., Revision of International Geomagnetic Reference Field
124     Released, EOS Trans. 77, #16, April 16, 1996.
125    
126     Barton, C.E., International Geomagnetic Reference Field: The Seventh
127     Generation, J. Geom. Geoelectr. 49, 123-148, 1997.
128    
129     Earth, Planets, and Space Journal, Vol. 52, No. 12, pp. 1117-1233, 2000
130    
131     M. Mandea et al., International Geomagnetic Reference Field - Epoch 2000
132     Revision Of The IGRF for 2000 - 2005, http://www.ngdc.noaa.gov/IAGA/wg8/igrf.html,
133     26 May 2000.
134    
135     International Geomagentic Reference Field - 2000, AGU EOS Transactions,
136     pp. 347, Aug 3, 2001
137    
138    
139     =========================================================================
140     National Space Science Data Center Data set MG-14G
141     =========================================================================

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