D. Heynderickx, B. Quaghebeur, J. Wera, H. De Witte BIRA, Ringlaan 3, B-1180 Brussel, Belgium H.D.R. Evans, E.J. Daly ESA/ESTEC, Keplerlaan 1, NL-2200 AG Noordwijk, The Netherlands SPENVIS ESA'S SPACE ENVIRONMENT INFORMATION SYSTEM Pasadena, GEANT4-SPENVIS workshop, 6-10 Nov 2006

Part 1: Existing SPENVIS (08 Nov 2006) Description of SPENVIS Models and tools Radiation (Overview of space environment and effects) Radiation sources Radiation effects Spacecraft charging Atmosphere and Ionosphere Magnetic field Meteoroids and debris Other models and tools databases Miscellaneous ECSS Practical info Pasadena, GEANT4-SPENVIS workshop, 6-10 Nov 2006 Overview – 1

Part 2: Ongoing updates and new developments (09 Nov 2006) Enhancements of existing models Orbit generator Source particles Charging: new Dictat version Effects: Niel curves New models Geant4 applications: SSAT, GEMAT, GRAS, GDML MarsREM SEPEM Architecture Used web tools Installation kits Pasadena, GEANT4-SPENVIS workshop, 6-10 Nov 2006 Overview – 2

What is SPENVIS? WWW based interface to models of the space environment and its effects on spacecraft and components: radiation sources: trapped particles, Solar energetic particles, GCR radiation effects: dose, NIEL, SEUs, solar cell degradation spacecraft charging magnetic fields atmosphere and ionosphere meteoroids and debris solar irradiance, … Models are run over spacecraft trajectories or coordinate grids Access to satellite data sets and geomagnetic indices On-line help and extensive background information Results in textual, tabular and graphical form Can be used as stand-alone application Pasadena, GEANT4-SPENVIS workshop, 6-10 Nov 2006

WARNING!!!! The next slides give a number of figures and statistics These figures should not be interpreted as being exact, without knowing how these were obtained Everyone dealing with numbers and statistics (scientific or other) should first read the following book: Darrell Huff, How to lie with statistics, W.W. Norton & Co Inc., New York, Pasadena, GEANT4-SPENVIS workshop, 6-10 Nov 2006

SPENVIS User community - 1 Intended usage: spacecraft engineering scientific educational support Currently 2,830 internationally registered active users (Data 8 Nov 2006) Listed on NASA’s Technical Standard site Used by major spacecraft industries and universities Pasadena, GEANT4-SPENVIS workshop, 6-10 Nov 2006

SPENVIS User community – 2 Pasadena, GEANT4-SPENVIS workshop, 6-10 Nov 2006

Radiation sources and effects Pasadena, GEANT4-SPENVIS workshop, 6-10 Nov 2006

Radiation environment Spacecraft orbit generator Runge-Kutta trajectory tracing Parameter input: 6 orbit parameters, pre-defined orbit types (heliosynchronous, GEO), Two Line Elements, multiple segments (LEO,GTO,GEO) Trajectory file uploads Grid generator Environment models trapped protons (including anisotropy) and electrons solar ions cosmic ray ions (GCR, ACR) Geomagnetic shielding for SEPs and CRs Pasadena, GEANT4-SPENVIS workshop, 6-10 Nov 2006

Radiation effects - 1 Radiation effect models ionizing dose non-ionizing dose solar cell degradation: damage equivalent electron fluence for different cell type single event upsets Mulassis: Geant4 Monte Carlo code for shielding analysis Pasadena, GEANT4-SPENVIS workshop, 6-10 Nov 2006

Radiation effects – 2 Sector analysis tool Basic building blocks (sphere, box, cylinder) to construct 3D model of satellite system VRML view of geometry 1D and 3D shielding distributions can be folded with flux and dose modelsfolded Pasadena, GEANT4-SPENVIS workshop, 6-10 Nov 2006

Spacecraft Charging Data sets: GORIZONT/ADIPE, CRRES/LEPA LEOPOLD: Environment parameters as a function of altitude DICTAT: internal deep dielectric charging FLUMIC trapped electron model Cylindrical and planar configurations Estimate of electrical breakdown and suggestions for design improvement SOLARC: interaction of solar array and spacecraft with plasma environment EQUIPOT: analysis of spacecraft surface charging Simple isolated patch on conducting sphere model Includes major current systems Extended with Katz secondary electron model Pasadena, GEANT4-SPENVIS workshop, 6-10 Nov 2006

Atmosphere and Ionosphere Models: NRLMSISE-00, MET V2, DTM, IRI-90, HWM Evaluation over spacecraft orbit: density, flux, and fluence of atmospheric or ionospheric constituents on an oriented surface along an orbit erosion depths for atomic oxygen Over coordinate grids Pasadena, GEANT4-SPENVIS workshop, 6-10 Nov 2006

Magnetic Field Orbital and grid version Field models: internal: IGRF/DGRF external: Mead-Fairfield, Olson-Pfitzer quiet and dynamic, Tsyganenko 87/89/96/01/04, Ostapenko-Maltsev, Alexeev (ISO draft standard) Drift shell tracing Used for trapped particle models (automatic selection of appropriate models) and geomagnetic cut-off calculations Fortran library: Pasadena, GEANT4-SPENVIS workshop, 6-10 Nov 2006

Meteoroids and Debris Flux as a function of mass or diameter Grün meteoroid model Debris models: NASA-90 NASA-96 Impact risk analysis Critical impacting particle diameter derived from particle/wall interaction model Probability of puncture Velocity distributions Pasadena, GEANT4-SPENVIS workshop, 6-10 Nov 2006

Other Models and Tools Interface to data bases: satellite data: GOES /SEM, ISEE-1/WIM, ISEE-2/KED, Meteosat-3/SEM-2, STRV-1B/REM, CRRES/MEA, SAMPEX/PET, UARS/PEM, AZUR/EI-88, MIR/REM magnetic and solar indices and parameters format: CDF (ISTP/IACG guidelines) with IDL interface and plotting library Links to and from ECSS-E standard Visualization of coordinate transformations Solar irradiance Sunlight, albedo, Earth emitted infrared Geomagnetic cut-off maps Stormer Magnetocosmics Pasadena, GEANT4-SPENVIS workshop, 6-10 Nov 2006

Practical info SPENVIS is available at Use of the Web service is free, but needs registration Commercial licences for PC Windows and Linux can be purchased Commercial and educational rates Multi and single user licenses Final GSTP contract extension has been approved and ESTEC contract started on 01 June Afterwards? Next SPENVIS User Workshop Europe Combined with GEANT4 ? Venue (ESRIN, Italy ?) and date (Nov 2007 – Feb 2008 ?) to be determined Pasadena, GEANT4-SPENVIS workshop, 6-10 Nov 2006

SPENVIS END OF PART 1 Thank you for your attention Pasadena, GEANT4-SPENVIS workshop, 6-10 Nov 2006