Drag to orbit the Earth. Choose an altitude, inclination and body torque axis, and the panel recomputes the IGRF-14 degree-1 field along one orbit and the fraction of magnetic control authority available to that axis — the screen behind the companion attitude-control paper. The in-browser calculation reproduces the deposited Python screen at every one of its 27 reference cases — nine orbits × three torque axes (checked live, below).
Screening model, not a simulator. Degree-1 (dipole) IGRF-14 at epoch 2025.0 — an auditable screen, not a full degree-13 propagation, disturbance model, structural model, or controller simulation. Authority η is the per-orbit fraction of torque a magnetic actuator can direct along the chosen axis; it says nothing about slew rate, which the paper bounds separately.
Orbit & field
Drag to rotate · scroll to zoom
orbit track geomagnetic dipole field field vector on the orbit
verifying against deposited screen…
Screen inputs
Provenance: in-browser port of argus_pd_repro/geomagnetic.py (IGRF-14 epoch 2025.0 degree-1: g₁⁰=−29,350.0, g₁¹=−1,410.3, h₁¹=4,545.5 nT). The screen.json reference set is the deposited geomagnetic_orbit_screen.csv; the badge above confirms the browser calculation matches it at every deposited orbit. Earth imagery: NASA Blue Marble (public domain). Illustrative screening model — not a controller simulation.