CPI NEXT GENERATION TRANSPORT PHENOMENOLOGY MODEL Harold Knight Douglas Strickland J. Scott Evans Computational Physics, Inc. Springfield, VA

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CPI RELEVANCE TO NASA PROGRAMS Scientific and Applied Research Remote sensing analysis – deriving energy inputs, neutral densities, temperatures, and electron densities from optical emissions An example of an application – NASA’s TIMED mission, GUVI auroral and dayglow optical emissions data (currently using legacy models) General planetary atmospheres

Text of CPI NEXT GENERATION TRANSPORT PHENOMENOLOGY MODEL Harold Knight Douglas Strickland J. Scott Evans...

CPI NEXT GENERATION TRANSPORT PHENOMENOLOGY MODEL Harold Knight Douglas Strickland J. Scott Evans Computational Physics, Inc. Springfield, VA CPI INTRODUCTION Transport Phenomenology Modeling Tool (TPMT) Electron and photon transport modeling and associated excitation processes Internet accessible, graphical user interface CORBA Component Model (CCM) architecture with coarse grain parallelization and distributed computing Legacy FORTRAN models reengineered in Java Embedded in more general Atmospheric Phenomenology Modeling Tool (APMT) CPI RELEVANCE TO NASA PROGRAMS Scientific and Applied Research Remote sensing analysis deriving energy inputs, neutral densities, temperatures, and electron densities from optical emissions An example of an application NASAs TIMED mission, GUVI auroral and dayglow optical emissions data (currently using legacy models) General planetary atmospheres CPI RELEVANCE TO NASA PROGRAMS cont. Support of Technology Goals TPMT based on Enterprise Java CORBA Component Model (EJCCM) Component-based approach provides interoperability with other component architecture compliant systems (CCM, EJB) Collaborative efforts supported with multiple users having concurrent, real-time access to algorithms, modeling inputs, and results that have been archived from prior executions of the tool CPI WORK COMPLETED PRIOR TO OCTOBER 2002 WORKSHOP Produced extensive set of use case specifications. Key specifications are: the conversion of the collision integral to a matrix representation local solution for the photoelectron flux transport solution for auroral electrons energy and altitude gridding algorithms parameterizing incident auroral electron energy distributions CPI WORK COMPLETED PRIOR TO OCT 2002 WORKSHOP cont. Domain model (functional requirements of the system obtained from an analysis of the use case model) Construction phase XML configuration files (e.g., cross section files) Implementation of auroral electron transport solution and photoelectron solution in local approximation Testing of implemented solutions CPI WORK COMPLETED SINCE OCT 2002 WORKSHOP Completed port of existing architecture to Enterprise Java CORBA Component Model (EJCCM) providing: Packaging and deployment to different hosts Model output archival, object state persistence Resonance-line photon transport solution: Wrote a detailed specification Implemented the model in Java, found processing time within a factor of 2 of FORTRAN Tested the solution by comparing with the original FORTRAN REDISTER solution (see next 2 pages) CPI WORK COMPLETED SINCE OCT 2002 WORKSHOP cont. CPI WORK COMPLETED SINCE OCT 2002 WORKSHOP cont. CPI Finish code for photoelectron transport solution using Feautrier method and column emission rate calculations Create wrappers for required pre-existing FORTRAN components that will not be implemented in Java Create a graphical user interface (GUI) for: Editing input parameters Archiving results in a database Browsing and exporting archived results (formats?) WORK TO BE COMPLETED CPI IT ISSUES Software Architecture Software development approach Transport phenomenology design CORBA Component Model (CCM) What is CORBA? What is the CCM? Enterprise Java CORBA Component Model (EJCCM) CPI COMPONENT AND OO DESIGN CONCEPTS Unified Modeling Language (UML) Physical Analysis Methodology (PAM) application of rigorous physical analysis facilitates the difficult tasks of developing the basic flow of events in use case specification as well as object diagrams PAM yields designs tailored for use in distributed, component-based architectures CPI EXAMPLES OF USE CASES Main Use Case DiagramExecute TPMT Use Case Diagram CPI Top-level PPMT design SOFTWARE ARCHITECTURE CPI Scattering phenomenology design Software Architecture (cont.) CPI Common Object Request Broker Architecture Maintained by the Object Management Group (OMG) Object-oriented architecture Open and vendor-independent Supports heterogeneous platforms Support heterogeneous programming languages Provides standard communication protocols Internet Inter-ORB Protocol (IIOP) Provides standard definition language Interface Definition Language (IDL) CORBA CPI CORBA V3.0 formally adopted by OMG Consists of interlocking conceptual pieces Abstract Component Model Packaging and Deployment Model Container Model Mapping to EJB Integration Model for Persistence and Transactions. Conceptual pieces enable a complete distributed enterprise server computing architecture. CORBA COMPONENT MODEL CPI Enterprise Java CORBA Component Model Developed by CPI for NASA Most advanced Java implementation of the CCM Proving ground for refinement of CCM specification Framework for APMT projects Framework for $50M Missile Defense Agency Project Released under open source licenseEJCCM CPI FUTURE APPLICATIONS All slides after this one describe remote sensing analysis done using legacy FORTRAN model (not TPMT). TPMT/APMT will provide new capabilities such as: Parallel processing for faster computation Internet access and collaboration Secure mode Improved model output archiving and database search Large scale simulation for entire globe (mission planning and/or data analysis) Capability for substituting components (plug-and-play capability), e.g. for comparing models and data CPI APPLICATIONS Using legacy models now. (TPMT is not ready yet.) Theoretical investigations and data analysis Behavior of dayglow and aurora Excitation processes Remote sensing Algorithm development Deriving information about processes, the state of atmosphere and ionosphere, and characteristics of external energy sources (solar EUV and precipitating electrons) Neutral density profiles Exospheric temperature Relative column abundances of neutral species (e.g., O/N 2 in terrestrial applications) Q EUV (integrated measure of solar EUV energy flux shortward of 45 nm) Ionospheric parameters (e.g., NmF2 and HmF2) etc. CPI TIMED/GUVI AND NRLMSIS GLOBAL O/N 2 ON 3/23/02 AND 3/24/02. DISTURBED COMPOSITION ON 3/24 CAUSED BY GEOMAGNETIC STORM CPI TIMED/GUVI-DERIVED Q EUV OVER STRONG SOLAR ROTATION AND COMPARISON WITH SCALED SOHO/SEM DATA. SOLAR FLARES PRODUCE FINE STRUCTURE CPI TIMED/GUVI auroral image from the N 2 LBH L FUV spectral channel CPI Auroral emission from N 2 (LBH L ), emission ratios, and derived data products (electron precipitation [E o and Q] and neutral composition [O density scaling factor f O ]) CPI REFERENCES TO DATA PRODUCT ILLUSTRATIONS Strickland, D. J., R. R. Meier, R. L. Walterscheid, A. B. Christensen, L. J. Paxton, D. Morrison, S. K. Avery, J. D. Craven, G. Crowley, and C.I-Meng, Quiet-time seasonal behavior of the thermosphere seen in the far ultraviolet dayglow, J. Geophys. Res., accepted, Strickland, D. J., J. L. Lean, R. R. Meier, A. B. Christensen, L. J. Paxton, D. Morrison, S. K. Avery, J. D. Craven, G. Crowley, C. I-Meng, R. L. Walterscheid, D. L. Judge, and D. McMullin, Solar EUV irradiance variability derived from the terrestrial dayglow, Geophys. Res. Lett., accepted, Strickland, D. J., J. H. Hecht, M. Conde, and D. Morrison, Auroral remote sensing using coincident satellite and ground-based optical observations, to be submitted to J. Geophys. Res., 2003. CPI AURORA