.CalculateGaussCoef

Annualized date time. E.g., 2015-02-01 = (2015 + 32/365) = 2015.088

Annualized reference time associated with <code>t</code>

String representing WMM version to use. Must be consistent with <code>time</code> and one of the following: 'derived', 'WMM2000', 'WMM2005', 'WMM2010', 'WMM2015', 'WMM2015v2', 'WMM2020'. Default 'derived' value will infer the latest WMM version consistent with <code>time</code>.

wmmVersion

Find Gauss coefficient \(g_{n,m}(t)\) consistent with the 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 and 2025. 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: 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>.

.CalculateGaussCoef: Lookup Table for Gauss coefficients g & h

Description

Usage

Arguments

Value