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The World Magnetic Model (WMM)
The purpose of this package is to make accessible the magnetic field
vector components from WMM. The supported date ranges for
wmm run from 2000-01-01 to 2024-12-31. The magnetic field
calculations across this time range agree with the official WMM test
values to the precision provided by the authors. I will update this
package for each new WMM version. For those that prefer a non-R
solution, the authors of WMM provide free software to calculate magnetic
field, which can be found here.
install.packages('wmm')In v1.1.1, the only exported function is
GetMagneticFieldWMM, which returns the orthogonal vector
components of the main magnetic field (in nT) and secular variation
field (in nT/yr) as predicted by WMM. The magnetic field elements,
h, f, i, and d (as well as their
secular variation) are returned as well.
Example usage:
GetMagneticFieldWMM(
lon = 240,
lat = -80,
height = 1e5,
time = 2022.5
)
# $x
# [1] 5814.966
#
# $y
# [1] 14802.97
#
# $z
# [1] -49755.31
#
# $xDot
# [1] 28.0382
#
# $yDot
# [1] 1.397062
#
# $zDot
# [1] 85.63095
#
# $h
# [1] 15904.14
#
# $f
# [1] 52235.36
#
# $i
# [1] -72.27367
#
# $d
# [1] 68.55389
#
# $hDot
# [1] 11.55182
#
# $fDot
# [1] -78.04815
#
# $iDot
# [1] 0.04066726
#
# $dDot
# [1] -0.09217566Note: The WMM is intended to be predictive. By using an older
set of coefficients, the returned values will reflect the older
predictions. If users need a good model of the Earth’s magnetic field
prior to the current WMM, please see the latest IGRF model,
which is retroactively updated. The wmmVersion feature is
intended for reproducibility purposes only.
GetMagneticFieldWMM(
lon = 240,
lat = -80,
height = 1e5,
time = 2017.5,
wmmVersion = 'WMM2015'
)
# $x
# [1] 5683.518
#
# $y
# [1] 14808.85
#
# $z
# [1] -50163.01
#
# $xDot
# [1] 28.16496
#
# $yDot
# [1] 6.941152
#
# $zDot
# [1] 86.24356
#
# $h
# [1] 15862.04
#
# $f
# [1] 52611.14
#
# $i
# [1] -72.45253
#
# $d
# [1] 69.0036
#
# $hDot
# [1] 16.57205
#
# $fDot
# [1] -77.23403
#
# $iDot
# [1] 0.04552524
#
# $dDot
# [1] -0.08599694Chulliat, A., W. Brown, P. Alken, C. Beggan, M. Nair, G. Cox, A. Woods, S. Macmillan, B. Meyer and M. Paniccia, The US/UK World Magnetic Model for 2020-2025: Technical Report, National Centers for Environmental Information, NOAA, doi: 10.25923/ytk1-yx35, 2020.
Chulliat, A., W. Brown, P. Alken, S. Macmillan, M. Nair, C. Beggan, A. Woods, B. Hamilton, B. Meyer and R. Redmon, 2019, Out-of-Cycle Update of the US/UK World Magnetic Model for 2015-2020: Technical Note, National Centers for Environmental Information, NOAA. doi: 10.25921/xhr3-0t19
Chulliat, A., S. Macmillan, P. Alken, C. Beggan, M. Nair, B. Hamilton, A. Woods, V. Ridley, S. Maus and A. Thomson, 2015, The US/UK World Magnetic Model for 2015-2020: Technical Report, National Geophysical Data Center, NOAA. doi: 10.7289/V5TB14V7
Maus, S., S. Macmillan, S. McLean, B. Hamilton, A. Thomson, M. Nair, and C. Rollins, 2010, The US/UK World Magnetic Model for 2010-2015, NOAA Technical Report NESDIS/NGDC.
McLean, S., S. Macmillan, S. Maus, V. Lesur, A. Thomson, and D. Dater, December 2004, The US/UK World Magnetic Model for 2005-2010, NOAA Technical Report NESDIS/NGDC-1.
Macmillian, S. and J. M. Quinn, 2000. “The Derivation of the World Magnetic Model 2000,” British Geological Survey Technical Report WM/00/17R.
These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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