1. NAME AND TITLE

MODEL: Models of Trapped Proton and Electron Environments for Solar Maximum and Minimum.

2. CONTRIBUTOR

NASA National Space Science Data Center, Goddard Space Flight Center, Greenbelt, Maryland.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; IBM 360/370 (C00329I303300).

4. NATURE OF PROBLEM SOLVED

MODEL is a computer code which describes the trapped electron and proton environment for solar minimum conditions. It consists of an inner zone model with an epoch of 1975 and an outer zone model with an epoch of 1964 and provides the flux at an arbitrary energy for an arbitrary point in B-L space.

5. METHOD OF SOLUTION

Omnidirectional flux plots are shown as a function of magnetic field strength B (units of gauss) and L value (units of earth radii) in carpet plot form. With the exception of 40-keV electrons, the inner and outer zones are mapped with three carpet plots. The first map covers the inner zone up to the slot region minimum, the second map covers the slot region to the outer zone maximum, and the final map covers the maximum up to the edge of the outer zone. Equator lines may be obtained by drawing the envelope of the high-flux side of the lines of constant L value.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

The sample problem took 3 seconds to run on the IBM 360/91.

8. COMPUTER HARDWARE REQUIREMENTS

The code is operable on the IBM 3033 computers.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required. If the IBM VS FORTRAN compiler is used, the option 'LANGLVL(66)' must be chosen.

10. REFERENCES

M. J. Teague and J. I. Vette, "A Model of the Trapped Electron Population for Solar Minimum," NSSDC 74-03 (April 1974).

D. M. Sawyer and J. I. Vette, "AP-8 Trapped Proton Environment for Solar Maximum and Solar Minimum," NSSDC/WDC-A-R&S 76-06 (December 1976).

J. I. Vette, "A Comparison of Trapped Proton Models AP8MIN and AP8MAX with their Compressed Versions AP8MIC and AP8MAC," Informal Notes (April 1977).

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents and one (1.2MB) DOS diskette which contains the source codes and sample problem input and output.

12. DATE OF ABSTRACT

January 1982, July 1988.

KEYWORDS: ELECTRON; PROTON; RADIATION ENVIRONMENT; SPACE RADIATION