Help: Trapped particle radiation

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

Overview

SPENVIS runs the AE9/AP9 model (V1.00, V1.30 and V1.50) over a spacecraft trajectory with the number of segments currently limited to 1.

If no trajectory has been generated yet, the orbit generator should be run first.

The input parameters and options for the AE9/AP9 model 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 run mode

The AE9/AP9 model comes along with four running modes corresponding to various types of flux data.

Mean: mean behaviour of the model with no uncertainty added
Percentile: statistical behaviour of the model with no uncertainty added
Perturbed: adds the uncertainty in the mean flux maps due to measurement and gap-filling errors
Monte Carlo: contains all of the perturbed mean uncertainty plus an estimate of the dynamic variations due to space weather processes

Mean provides the mean value. The percentile number is in the range 1-99. For the Perturbed and Monte Carlo modes, the user need to set the 'Nr. of Runs' in the range 1-999 (typical values are > 10) and has the choice to compute the aggregates 'mean' or 'percentile' across the different runs (scenarios) at each timestep.

Energies

The user has the option to run the model for the following set of energy values:

Default SPENVIS energies:

Proton Energies (MeV)	0.10, 0.15, 0.20, 0.30, 0.40, 0.50, 0.60, 0.70, 1.00, 1.50, 2.00, 3.00, 4.00, 5.00, 6.00, 7.00, 10.0, 15.0, 20.0, 30.0, 40.0, 50.0, 60.0, 70.0, 100, 150, 200, 300, 400, 500
Electron Energies (MeV)	0.04, 0.10, 0.20, 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 1.00, 1.25, 1.50, 1.75, 2.00, 2.25, 2.50, 2.75, 3.00, 3.25, 3.50, 3.75, 4.00, 4.25, 4.50, 4.75, 5.00, 5.50, 6.00, 6.50, 7.00

Default AE9/AP9 energies:

Proton Energies (MeV)	0.10, 0.20, 0.40, 0.60, 0.80, 1.00, 2.00, 4.00, 6.00, 8.00, 10.0, 15.0, 20.0, 30.0, 50.0, 60.0, 80.0, 100, 150, 200, 250	v1.00
Proton Energies (MeV)	0.10, 0.20, 0.40, 0.60, 0.80, 1.00, 2.00, 4.00, 6.00, 8.00, 10.0, 15.0, 20.0, 30.0, 50.0, 60.0, 80.0, 100, 150, 200, 300, 400, 700, 1200, 2000	v1.30, v1.50
Electron Energies (MeV)	0.04, 0.07, 0.10, 0.25, 0.50, 0.75, 1.00, 1.50, 2.00, 2.50, 3.00, 3.50, 4.00, 4.50, 5.00, 5.50, 6.00, 6.50, 7.00, 7.50, 8.00	v1.00
Electron Energies (MeV)	0.04, 0.07, 0.10, 0.25, 0.50, 0.75, 1.00, 1.50, 2.00, 2.50, 3.00, 3.50, 4.00, 4.50, 5.00, 5.50, 6.00, 6.50, 7.00, 8.50, 10.0	v1.30, v1.50

User defined energies:

Maximum 100 energy points can be inserted for the proton and electron flux spectrum separately. The energy values should be in ascending order. For the electrons and protons the allowed energy range is resp. [0.04,10] MeV and [0.1,2000] MeV.

Results

The AE9/AP9 model 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_ae9ap9.html contains the input parameters and summary tables. The orbit averaged spectra for trapped protons and electrons are stored in the spenvis_tri.txt file.

**Output files generated by AE9/AP9**
File name	Description
`spenvis_ae9ap9.html`	Report file
`spenvis_tri.txt`	Orbit averaged spectra for SHIELDOSE(-2), NIEL, EQFLUX, MULASSIS, GRAS, GEMAT, PLANETOCOSMICS, NEWUPSETO, LONGUPSET

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.

AE9/AP9 Guidance for 3rd party developers

The AE9/AP9 model was envisioned from the beginning as a module to be integrated into existing and future satellite mission analysis packages. The basic interface to AE9/AP9 is described in an Application Programming Interface document. However, to exploit the statistical features of AE9/AP9, it is necessary to understand how to use the AE9/AP9 API to generate appropriate statistical quantities. This document provides guidance on what calculations to perform with AE9/AP9 itself, and what statistical manipulations to perform in post-processing to obtain valid statistical results. This document includes worked examples of computing percentiles of a dose-depth curve and percentiles of a worst-case internal charging proxy. T. Paul O'Brien, "AE9/AP9 Guidance for Third-Party Developers", AEROSPACE REPORT NO. TOR-2014-01204, March 25, 2014.

AE9/AP9 model versions

Validation and comparisons of the AE9/AP9 model versions are available at Virtual Distributed Laboratory

Last update: $LastChangedDate: 2016-07-05 17:00:00 CET$