tobari

Earth environment models — atmospheric drag density, IGRF geomagnetic field, and space weather integration for orbital mechanics simulation. The name 「帳」(tobari) means “veil” — Earth’s atmosphere and magnetosphere form the environmental veil a spacecraft flies through.

Provides:

• Atmospheric density models (Exponential, HarrisPriester, NRLMSISE-00) behind the AtmosphereModel trait, with typed SimpleEci position input.
• IGRF-14 full geomagnetic field + tilted-dipole approximation via MagneticFieldModel.
• Space weather providers (CSSI, GFZ) feeding F10.7 / Ap / Kp indices into the atmosphere models.