Mitigating Spherical Harmonic Singularities in IGRF Calculations

[seki-hiro]

Details

Description

When calculating the geomagnetic field based on IGRF, the calculation diverges near equatorial latitudes close to ±90 degrees due to the singularity of spherical harmonics.

Conditions of occurrence

This issue arises in cases using polar orbits.

Additional information

https://github.com/ut-issl/s2e-core/blob/develop/src/math_physics/geomagnetic/igrf.cpp#L92

Tasks

• Implement a case distinction to handle calculations when equatorial latitudes are large.

Impact

Only polar orbits

Supplementary notes

N/A

Notes

• Provide a conclusion before closing the issue.