wmm - World Magnetic Model
Calculate magnetic field at a given location and time
according to the World Magnetic Model (WMM). Both the main
field and secular variation components are returned. This
functionality is useful for physicists and geophysicists who
need orthogonal components from WMM. Currently, this package
supports annualized time inputs between 2000-01-01 to
2029-12-31. If desired, users can specify which WMM version to
use, e.g., the original WMM2015 release or the recent
out-of-cycle WMM2015 release. Methods used to implement WMM,
including the Gauss coefficients for each release, are
described in the following publications: NOAA NCEI Geomagnetic
Modeling Team and British Geological Survey (2024)
<doi:10.25921/aqfd-sd83>, Chulliat et al (2020)
<doi:10.25923/ytk1-yx35>, Chulliat et al (2019)
<doi:10.25921/xhr3-0t19>, Chulliat et al (2015)
<doi:10.7289/V5TB14V7>, Maus et al (2010)
<https://www.ngdc.noaa.gov/geomag/WMM/data/WMMReports/WMM2010_Report.pdf>,
McLean et al (2004)
<https://www.ngdc.noaa.gov/geomag/WMM/data/WMMReports/TRWMM_2005.pdf>,
and Macmillian et al (2000)
<https://www.ngdc.noaa.gov/geomag/WMM/data/WMMReports/wmm2000.pdf>.
