satellitetoolbox-geomagnetic

name	satellitetoolbox-geomagnetic
description	SatelliteToolboxGeomagneticField.jl for computing Earth's geomagnetic field using IGRF and dipole models. Use when computing magnetic field vectors, IGRF field values, or geomagnetic torques on spacecraft.

SatelliteToolboxGeomagneticField.jl

Earth's geomagnetic field computation. Repo: JuliaSpace/SatelliteToolboxGeomagneticField.jl

IGRF Model

# Angles in radians
B = igrf(date, r, λ, Ω; max_degree=13)                     # Geocentric (default)
B = igrf(date, h, λ, Ω, Val(:geodetic); max_degree=13)     # Geodetic

# Angles in degrees (d suffix)
B = igrfd(date, r, λ_deg, Ω_deg; max_degree=13)
B = igrfd(date, h, λ_deg, Ω_deg, Val(:geodetic))

Simplified Dipole Model

B = geomagnetic_dipole_field(r_ecef, year)   # r_ecef in meters, returns B in ECEF [nT]

Pre-allocated Legendre Buffers

B = igrf(date, r, λ, Ω; P=P_matrix, dP=dP_matrix)

Key Conventions

• date as decimal year (e.g., 2024.5), valid range: 1900-2035
• igrf: angles in radians. igrfd: angles in degrees
• Altitude/distance in meters
• Output: geomagnetic field in nT in NED (North-East-Down) frame
• Position reference: Val(:geocentric) (default) or Val(:geodetic)
• IGRF v14, spherical harmonics up to degree 13