astrodyn_atmosphere

Neutral-atmosphere density, temperature, pressure, and wind models for the astrodyn_bevy workspace.

Ports models/environment/atmosphere/ from NASA JEOD v5.4.0, including the Marshall Engineering Thermosphere (MET) implementation in models/environment/atmosphere/MET/.

Layered architecture

astrodyn_bevy        (Bevy ECS adapter, mission code)
   ↓
astrodyn         (orchestration, recipes, single API surface)
   ↓
astrodyn_atmosphere  ←  this crate (pure Rust, zero Bevy)
   ↓
astrodyn_quantities  (typed mass density, pressure, velocity)

astrodyn_atmosphere is part of the astrodyn_* physics layer — pure Rust with no Bevy dependency.

Public surface

• AtmosphereState — density / temperature / pressure / inertial-frame wind, returned by every model evaluation.
• exponential — rho = rho_0 * exp(-(h - h_0) / H). Single-parameter scale-height fallback and unit-test baseline.
• met — Marshall Engineering Thermosphere model (Jacchia 1970/1971). Production model for LEO drag.
• compute_corotation_wind / compute_corotation_wind_typed — omega × r co-rotation wind for planets whose angular velocity points along the inertial Z axis.

See also

• docs/JEOD_invariants.md — AT.* invariants this crate enforces.
• Project README and CLAUDE.md — workspace-level architecture.
• Rendered rustdoc: https://docs.rs/astrodyn_atmosphere