CCC-0024 CARSTEP. (Abstract last modified 07-JUN-1988)
1.
NAME OR DESIGNATION OF PROGRAM - CARSTEP. 2.
COMPUTER FOR WHICH PROGRAM IS DESIGNED AND OTHER MACHINE VERSION PACKAGES AVAILABLE -
To request or retrieve programs click on the one of the active versions below.
A password and special authorization is required. Explanation of the status codes.
Machines used:
Package-ID Orig.Computer Test Computer
CCC-0024/01 IBM 7090 IBM 3090
3.
DESCRIPTION OF PROGRAM OR FUNCTION - The CARSTEP code determines the flux of particles from the Van Allen zones that strike a space vehicle which is executing a mission in that volume of space. Using latitude, longitude, altitude of perigee, inclination and eccentricity of orbits, and mission time as input, the following data is given: latitude, longitude, and altitude of the vehicle at points along the trajectory, the flux of particles at these points, and time integrated flux for the total mission.
4.
METHOD OF SOLUTION - The position of the vehicles as a function of time is determined by a two-body analysis. The program is divided into three parts: lunar transfer trajectories, lunar return trajectories, and geocentric orbits.
5.
RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM - The earth is considered a perfect sphere and atmospheric drag is neglected. One energy spectrum for particles is valid throughout the volume of space.
6.
TYPICAL RUNNING TIME - Estimated running time of sample problem: 5 minutes. 7.
UNUSUAL FEATURES OF THE PROGRAM - 8.
RELATED AND AUXILIARY PROGRAMS - This code was developed by combining a two-body trajectory program with NASA Goddard's environment routine.
9.
STATUS 10.
REFERENCES - 11.
MACHINE REQUIREMENTS - The code was designed for an IBM 7090 or 7094 computer. A 32,768 core memory and three tape units are required.
12.
PROGRAMMING LANGUAGE(S) USED - 13.
OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED - The code was designed for, and is operable on the IBM FORTRAN II Monitor System. The only tape assignments necessary are for input, output and the system. It may easily be made compatible with other FORTRAN compilers.
14.
OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS - 15.
NAME AND ESTABLISHMENT OF AUTHORS - 16.
MATERIAL AVAILABLE - 17.
CATEGORIES - Keywords: SPACE RADIATION
Program-name Package-ID Status
CARSTEP CCC-0024/01 Tested
The environment portion of CARSTEP uses a coordinate system (B,L) for mapping the distribution of geomagnetically trapped particles which has been developed by C.E. McIlwain.
CCC-0024/01:
NEA-DB executed the test case included in this package on an IBM 3090 computer in 2 seconds of CPU time.
CCC-0024/01: 07-JUN-1988 Tested at NEADB
CCC-0024/01:
- M. R. Morrison and A. E. Tate :
Determination of Particle Fluxes Impinging on a Spacescraft
NSL 63-63R-1 (September 1963)
CCC-0024/01:
The test case ran on IBM 3090 in 224K bytes of main storage.
CCC-0024/01: FORTRAN-77
CCC-0024/01:
(1) An IBM version of the code has been generated by converting the source from FORTRAN-II to FORTRAN-IV and compiling it under MVS/XA using the FORTRAN VS2 compiler with option LEVEL-66. (2) For implementation on VAX machines, a FORTRAN-77 version was produced and run on a VAX-11/780 under VMS V4.6.
Northrop Space Laboratory
Hawthorne, California
Aerospace Medical Research Laboratory
Wright-Patterson Air Force Base, Ohio
CCC-0024/01:
CCC0024_01.001 Information file 65 records
CCC0024_01.002 JCL to compile, link and execute a sample 80 records
CCC0024_01.003 CARSTEP source (Fortran-77, level-66) 876 records
CCC0024_01.004 Sample problem input (unit 5) 276 records
CCC0024_01.005 Sample problem print (unit 6) 1026 records
- J. Gamma Heating and Shield Design
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