source: Sophya/trunk/SophyaExt/XAstroPack/magfield.h@ 3586

Last change on this file since 3586 was 1672, checked in by cmv, 24 years ago

modeles de champ magnetiques terrestres cmv 06/10/01
File size: 2.3 KB
Line 
1/* magfield.h -- compute local magnetic variation given position,
2** altitude, and date
3**
4** This is an implementation of the NIMA WMM 2000
5**
6** http://www.nima.mil/GandG/ngdc-wmm2000.html
7** For WMM2000 coefficients:
8** ftp://ftp.ngdc.noaa.gov/Solid_Earth/Mainfld_Mag/DoD_Model/wmm.cof
9** For IGRF/DGRF coefficients:
10** http://swdcdb.kugi.kyoto-u.ac.jp/igrf/coef/igrfall.d
11**
12** Copyright (C) 2000 Edward A Williams <Ed_Williams@compuserve.com>
13**
14** Adapted from Excel 3.0 version 3/27/94 EAW
15** Recoded in C++ by Starry Chan
16** WMM95 added and rearranged in ANSI-C EAW 7/9/95
17** Put shell around program and made Borland & GCC compatible EAW 11/22/95
18** IGRF95 added 2/96 EAW
19** WMM2000 IGR2000 added 2/00 EAW
20** Released under GPL 3/26/00 EAW
21** Adaptions and modifications for the SimGear project 3/27/2000 CLO
22**
23** This program is free software; you can redistribute it and/or
24** modify it under the terms of the GNU General Public License as
25** published by the Free Software Foundation; either version 2 of the
26** License, or (at your option) any later version.
27**
28** This program is distributed in the hope that it will be useful, but
29** WITHOUT ANY WARRANTY; without even the implied warranty of
30** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
31** General Public License for more details.
32**
33** You should have received a copy of the GNU General Public License
34** along with this program; if not, write to the Free Software
35** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
36**
37*/
38#ifndef MAGFIELD_H
39#define MAGFIELD_H
40
41#ifdef __cplusplus
42extern "C" { /* extern "C" */
43#endif
44
45/* Convert date to Julian day 1950-2049 */
46unsigned long int yymmdd_to_julian_days( int yy, int mm, int dd );
47
48/* Convert degrees to radians */
49double deg_to_rad( double deg );
50
51/* Convert radians to degrees */
52double rad_to_deg( double rad );
53
54/* return variation (in radians) given geodetic latitude (radians), longitude
55(radians) ,height (km), (Julian) date and field model
56model=1 is IGRF90, 2 is WMM85, 3 is WMM90, 4 is WMM95, 5 is IGRF95,
576 is WMM2000, 7 is IGRF2000
58N and E lat and long are positive, S and W negative
59*/
60double SGMagVar( double lat, double lon, double h, long dat, int model, double* field );
61
62#ifdef __cplusplus
63} /* extern "C" */
64#endif
65
66#endif
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