NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
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archive sets, application modules, <strong>and</strong> 1-D, 2-D, <strong>and</strong> 3-D visualization tools are provided to all models while FTP scripts are<br />
provided to automatically update common daily global input parameters. Dynamic capabilities permit multiple environments<br />
to be generated at user-specified time intervals while animation tools enable, for example, the display of satellite orbits <strong>and</strong><br />
environment data together as a function of time. Documentation examples include detailed instructions for investigating<br />
phenomena that have well known effects on communications <strong>and</strong> spacecraft systems. To obtain a copy of AF-GEOSpace<br />
Version 2.0 for Windows NT/2000/XP, please contact the first author.<br />
Author<br />
Computerized Simulation; Computer Programs; Graphical User Interface; <strong>Aerospace</strong> Environments; Space Weather; Solar<br />
Radiation; Environment Models<br />
20040111077 <strong>NASA</strong> Marshall Space Flight Center, Huntsville, AL, USA<br />
Validation of NASCAP-2K Spacecraft-Environment Interactions Calculations<br />
Davis, V. A.; M<strong>and</strong>ell, M. J.; Gardner, B. M.; Mikellides, I. G.; Neergaard, L. F.; Cooke, D. L.; Minor, J.; 8th Spacecraft<br />
Charging Technology Conference; March 2004; 19 pp.; In English; See also 20040111031; No Copyright; Avail: CASI; A03,<br />
Hardcopy<br />
The recently released Nascap-2k, version 2.0, three-dimensional computer code models interactions between spacecraft<br />
surfaces <strong>and</strong> low-earth-orbit, geosynchronous, auroral, <strong>and</strong> interplanetary plasma environments. It replaces the earlier<br />
three-dimensional spacecraft interactions codes NASCAP/GEO, NASCAP/LEO, POLAR, <strong>and</strong> DynaPAC. Nascap-2k has<br />
improved numeric techniques, a modern user interface, <strong>and</strong> a simple, interactive satellite surface definition module (Object<br />
ToolKit). We establish the accuracy of Nascap-2k both by comparing computed currents <strong>and</strong> potentials with analytic results<br />
<strong>and</strong> by comparing Nascap-2k results with published calculations using the earlier codes. Nascap-2k predicts Langmuir-<br />
Blodgett or Parker-Murphy current collection for a nearly spherical (100 surfaces) satellite in a short Debye length plasma<br />
depending on the absence or presence of a magnetic field. A low fidelity (in geometry <strong>and</strong> time) Nascap-2k geosynchronous<br />
charging calculation gives the same results as the corresponding low fidelity NASCAP/GEO calculation. A high fidelity<br />
calculation (using the Nascap-2k improved geometry <strong>and</strong> time stepping capabilities) gives higher potentials, which are more<br />
consistent with typical observations. Nascap-2k predicts the same current as a function of applied potential as was observed<br />
<strong>and</strong> calculated by NASCAP/LEO for the SPEAR I rocket with a bipolar sheath. A Nascap-2k DMSP charging calculation gives<br />
results similar to those obtained using POLAR <strong>and</strong> consistent with observation.<br />
Author<br />
Spacecraft Charging; Computer Programs; Program Verification (Computers)<br />
20040111110 Office National d’Etudes et de Recherches Aerospatiales, Toulouse, France<br />
Design of a New Modular Spacecraft Plasma Interaction Modeling Software (SPIS)<br />
Roussel, J.-F.; Rogier, F.; Lemoine, M.; Volpert, D.; Rousseau, G.; Sookahet, G.; Seng, P.; Hilgers, A.; 8th Spacecraft Charging<br />
Technology Conference; March 2004; 15 pp.; In English; See also 20040111031; No Copyright; Avail: CASI; A03, Hardcopy<br />
The development of a new software for spacecraft plasma interactions modeling was started in Europe at the end of 2002.<br />
This Spacecraft Plasma Interaction Software (SPIS) is developed for <strong>and</strong> by SPINE community (Spacecraft Plasma Interaction<br />
Network in Europe) on an open source basis. The ESA contractors, ONERA, Artenum, <strong>and</strong> University Paris 7 are in charge<br />
of the development of SPIS framework <strong>and</strong> main numerical modules. SPINE community will be able to add extra modules<br />
<strong>and</strong> apply the code to its needs. The software framework is based on the integration or interfacing with available open source<br />
tools for CAD, 2D meshing, 3D meshing, GUI, post-processing <strong>and</strong> graphical display. The numerical routines will allow the<br />
modeling of plasma dynamics (kinetic or fluid, electrostatic with possible extension to electromagnetic) <strong>and</strong> its coupling with<br />
the spacecraft (equivalent circuit approach). The modeling of all types of environments <strong>and</strong> devices will be allowed<br />
(LEO/GEO/PEO , EP/solar arrays ). The emphasis has been put on the code modularity to allow the interoperability of<br />
modules, through an object-oriented approach throughout the code. User requirements were defined in February 2003 (4th<br />
SPINE meeting), major technological choices <strong>and</strong> top level design were performed in June 2003 (unstructured mesh is the<br />
basics, Java language was selected for coding, pre-post/processing tools were chosen). The first release of the framework was<br />
in October 2003. The major features of the software framework <strong>and</strong> of the physical numerical routines are presented in this<br />
paper.<br />
Author<br />
Software Engineering; Plasmas (Physics); Computer Programming; Plasma Interactions; Graphical User Interface<br />
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