The space-developed dynamic vertical cutoff rigidity model and its applicability to aircraft radiation dose

Area of Science:

• Space Physics
• Radiation Physics
• Aerospace Engineering

Background:

• Energetic charged particle transmission through the magnetosphere poses radiation risks.
• Existing models are primarily for space applications, with limited use for atmospheric radiation.
• Accurate prediction of cosmic radiation at flight altitudes is crucial.

Purpose of the Study:

• To develop a dynamic geomagnetic vertical cutoff rigidity model.
• To adapt the model for calculating aircraft radiation dose.
• To provide a comprehensive tool for assessing radiation exposure during flights.

Main Methods:

• Developed a dynamic geomagnetic vertical cutoff rigidity model.
• Utilized particle trajectory tracing in a magnetospheric model to generate world grids of cutoff rigidities.
• Employed the McIlwain "L" parameter for interpolation to adjust satellite-altitude rigidities to aircraft altitudes.

Main Results:

• Created world grids of vertical cutoff rigidities for all magnetic activity levels (Kp 0-9+).
• Calculated cutoff rigidities at satellite altitudes covering various geomagnetic conditions.
• Successfully adapted satellite-altitude cutoff rigidities to aircraft altitudes.

Conclusions:

• The developed dynamic geomagnetic vertical cutoff rigidity model is applicable for computing aircraft radiation dose.
• This model provides a valuable tool for assessing and mitigating radiation exposure for aircrew and passengers.
• The methodology offers a robust approach for adapting space-based radiation models to terrestrial applications.