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


SPENVIS can run trapped particle radiation models over a spacecraft trajectory. Three possibilities are available
  1. the standard models (this page)
  2. the IRENE models (AE9/AP9)
  3. the direct upload of spectra
Remark that the IRENE models and the functionality for uploading spectra are only avalible for advanced users. The user can upgrade his account to advanced through "My account" on the homepage navigation menu.

The number of segments is currently limited to 1 for the two last possibilities.

In order to run these models, a spacecraft trajectory is needed. If no trajectory has been generated yet, the orbit generator should be run first.

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

The button calls up the model selection page for consecutive runs of multiple models. This feature is available for advanced users only.

Warning: using these buttons deletes all existing output from the trapped radiation models and from any model that uses this output, in order to ensure consistency in the outputs.

Input parameters

Model selection

Select a trapped proton and a trapped electron model (and model versions if applicable) by means of the respective selection menus.

For the AE-8 electron models, a local time dependence implemented by Vette can be applied by advanced users. Also, confidence levels can be specified for the electron fluxes. A confidence level of 50% corresponds to the average model flux, the lower and higher confidence levels correspond to the average flux minus or plus a number of standard deviations.

Note:The IGE-2006 model could only be selected for geostationary orbits.


The Earth 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. For AE9/AP9 only the orbit averaged spectra for protons and electrons (= spenvis_tri.txt file) are produced.

The report file spenvis_trp.html contains the input parameters and summary tables. The report files spenvis_ppeakfl.html and spenvis_epeakfl.html contain data related to the proton and electron peak fluxes respectively. The orbit averaged spectra for trapped protons and electrons are stored in the spenvis_tri.txt file. The spectrum files spenvis_spp.txt and spenvis_spe.txt contain, for each orbital point, the full spectra of trapped protons and electrons, respectively.

Output files generated by the trapped radiation models
File name Description
spenvis_trp.html Report file
spenvis_ppeakfl.html Report file specific for proton peak fluxes
spenvis_epeakfl.html Report file specific for electron peak fluxes
spenvis_spp.txt Proton spectra for each orbital point for NEWUPSETO
spenvis_spe.txt Electron spectra for each orbital 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.

The button calls up the output page for consecutive runs of multiple models. This button only appears when the trapped radiation models have been included in the combined model run selection. This feature is available for advanced users only.

Last update: Mon, 12 Mar 2018