G3: Near-earth radiation and plasma environment


Ian Mann (University of Alberta, Canada), imann@ualberta.ca  


Yihua Zheng (NASA/GSFC, USA), yihua.zheng@nasa.gov 


(Aero)Space Assets Functions

  • Surface charging
  • Internal charging
  • Single Event Effects (SEE)
  • Total dose

Human health

  • Aviation safety
  • Astronauts health at LEO orbits


The near-earth radiation and plasma environment consist of diverse particle populations of different origins that often evolve dynamically over time and space, and span across a broad energy range. Such an environment poses challenges from both science and space weather-impact perspectives. It brings about deleterious effects on spacecraft electronics and/or life in space. 


  1. Perform impact-driven model assessment
  2. Advance science understanding and modeling capability of the near-Earth radiation and plasma environment
  3. Stay current with relevant clusters' progress and actively seek collaborative inter-cluster efforts

Essential Space Environment Quantities / Forecasting Goals:  

  Effects Science Timescale
Surface Charging >10 keV electron flux >10 keV e- flux; Te; Ne seconds
Internal Charging >100 fA/cm2 [100 mils] 1 MeV and >2 MeV e- flux 24-hr, 48-hr averaged
Single Event Effects SEE rate [100 mils] >30 MeV p+ flux; >15 MeV.cm2.mg-1 LET flux 5-min, daily, weekly
Total Dose

dose in Si [100 mils; 4 mils]

30-50 MeV p+ flux; >1.5 MeV e- flux; 1-10 MeV p+ daily, weekly, yearly
Radiation Effects at Aviation Altitudes dose rate in aircraft (D-index) 2 spectral parameters (power law with rigidity) 5-min, hourly

Action topics:

For list of action topics please click "Read more":