Module jupiter_radiation 

Jupiter radiation belt dose model for SOLAR LINE EP02 analysis.

Models radiation dose rate as a function of distance from Jupiter using a piecewise power-law model calibrated to Galileo-era measurements.

The model estimates TID (Total Ionizing Dose) behind a reference shielding thickness, expressed in krad(Si) behind 100 mil Al equivalent.

Physical basis:

• Jupiter’s radiation belts are the most intense in the solar system
• Trapped electron population dominates dose in the 10-30 RJ region
• Dose rate falls off roughly as a power law with distance
• The magnetopause (~50-100 RJ on dayside) marks the outer boundary

Calibration references:

• Europa (~9.4 RJ): ~5,400 krad/year behind 100 mil Al (Galileo DDD)
• Ganymede (~15 RJ): ~540 krad/year behind 100 mil Al
• Callisto (~26 RJ): ~1 krad/year behind 100 mil Al
• These values are order-of-magnitude from NASA Europa mission studies and the Galileo Design Dose Document (DDD).

Key insight for EP02: The ship AI’s “radiation shield remaining life: 42 min” is best interpreted as dose_budget_remaining / instantaneous_dose_rate, evaluated at the current position (~15 RJ). As the ship moves outward, the dose rate drops dramatically, so the actual time to shield depletion increases — potentially allowing the entire escape to succeed within budget.

Structs

JupiterRadiationConfig

Configuration for the Jupiter radiation dose model.

JupiterTransitResult

Results of a Jupiter radiation transit analysis.

RadiationRegion

A region of the piecewise power-law dose model.

Constants

JUPITER_RADIUS_KM

Jupiter equatorial radius in km.

Functions

ep02_jupiter_escape_analysis

EP02 scenario: Kestrel’s Jupiter escape from Ganymede orbit.

minimum_survival_velocity

Find the minimum average radial velocity for shield survival.