Table of Contents ECSS Model Page
Background Information Radiation sources and effects
Trapped radiation

This implementation of the trapped radiation models runs in combination with the coordinate grid generator. SPENVIS verifies if a coordinate grid has been generated prior to accessing the model page. If not, an error message is displayed with a link to the coordinate grid generator. Please note that running the grid generator will delete all existing output resulting from models that use the coordinate grid.

The trapped radiation models can be evaluated over the following domains:

  1. one single geographical point, with pitch angle as an independent variable;
  2. a one-dimensional range of geographical points;
  3. a two-dimensional map in latitude and longitude, at fixed altitude and universal or local time.

The input parameters and options for the models are described below. When the input form has been completed, pressing the button will start the calculation and bring up the "Results" page.

Model parameters

Selecting a model in this application consists of selecting a particle type and one of the models (and model versions if applicable) available for that particle. In addition, an energy level and pitch angle value have to be specified.

If the coordinate grid generated previously is of the type "single geographic position", a range of pitch angles can be specified. For other coordinate grid types (profile, world map), this option is not available. The pitch angle range is defined by specifying the last value in the range, and the increments between the first and last value. The parameter can be incremented with a fixed step size, or the number of values can be specified.


The trapped radiation models produce the files listed in the table below. A description of the file formats can be brought up by clicking on their description in the table.

The report file spenvis_tpp.html contains the input parameters and summary tables. The spenvis_tpo.txt file contains particle fluxes and magnetic coordinates for each grid point.

Output files generated by the trapped radiation models
File name Description
spenvis_tpp.html Report file
spenvis_tpo.txt Particle fluxes and magnetic coordinates for each grid point

To generate plots, select the plot type(s), options and graphics format, and click the or button. The current page will be updated with the newly generated plot files.

Last update: Mon, 12 Mar 2018