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New equations model atmospheric ionizing radiation for aviation safety. Galactic cosmic ray (GCR) and relativistic energetic particle (REP) dose rates are calculated, revealing a 15% increase in radiation at aviation altitudes.

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Area of Science:

  • Aerospace Engineering
  • Radiation Physics
  • Atmospheric Science

Background:

  • The Nowcast of Atmospheric Ionizing Radiation for Aviation Safety model and the Automated Radiation Measurements for Aerospace Safety (ARMAS) database provide crucial data for understanding aviation radiation environments.
  • Galactic cosmic rays (GCR) and relativistic energetic particles (REP) contribute to the ionizing radiation exposure experienced by aircrews and passengers.
  • Existing models may not fully account for the combined effects of GCR and REP, particularly in specific L-shell ranges.

Purpose of the Study:

  • To present polynomial fit equations for the Nowcast of Atmospheric Ionizing Radiation for Aviation Safety model and the ARMAS statistical database.
  • To enable calculation of effective dose rates from GCR and REP environments based on altitude, L shell, and geomagnetic conditions.
  • To investigate the potential contribution of REP to radiation exposure at aviation altitudes.

Main Methods:

  • Development of polynomial fit equations using altitude, L shell, and geomagnetic conditions.
  • Utilizing a subset of the ARMAS database to represent GCR plus probable REP effective dose rates.
  • Analyzing Western Hemisphere observations within L shells 1.5 to 5.

Main Results:

  • Effective dose rates from GCR environments can be calculated using the derived equations.
  • A combined GCR and REP effective dose rate equation was developed for specific L shell ranges.
  • The study identified that combined radiation effects in the analyzed L shell range are approximately 15% higher than GCR background alone.
  • Solar energetic particle events were excluded from this analysis.

Conclusions:

  • The derived polynomial equations provide a valuable tool for assessing atmospheric ionizing radiation for aviation safety.
  • There is evidence suggesting a REP contribution to radiation exposure at aviation altitudes, particularly within specific L shell ranges.
  • The ARMAS database and derived equations have applications in radiation climatology, nowcasting, forecasting, and air traffic management.