This module evaluates the atmospheric neutron spectrum at any point or along any trajectory. The model is based on the Avionics/SE software.¹

The module may be used for estimating the neutron spectrum at sea level, on aircraft flight paths, or on ballistic trajectories. The spectrum may then be used to compute neutron-induced single event upsets and other neutron radiation effects within Space Radiation.

The Avionics/SE model has a number of powerful features including:

• Includes both mean and worst-case environments. Mean environment corresponds to the normal neutron levels encountered at solar minimum. Worst-case environment corresponds to a very large ground level solar flare event.
• Allows the neutron fluence to be summed or averaged over the trajectory, or identifies the peak flux along the trajectory.
• Works with any Space Radiation orbital trajectory file.
• Applicable for altitudes from sea level to 100 km.
• Includes the magnetic cutoff effect variation with latitude and longitude.