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Robert E. McGuire SPDF/Code 612.4, NASA Goddard Space Flight Center Greenbelt MD 20771

Services of the Space Physics Data Facility (SPDF) / Sun-Earth Connection Active Archive (SECAA) and the THEMIS Mission. Robert E. McGuire SPDF/Code 612.4, NASA Goddard Space Flight Center Greenbelt MD 20771. Major SECAA Services Today Relevant to THEMIS Science - 1. Common Data Format (CDF)

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Robert E. McGuire SPDF/Code 612.4, NASA Goddard Space Flight Center Greenbelt MD 20771

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  1. Services of the Space Physics Data Facility (SPDF) / Sun-Earth Connection Active Archive (SECAA)and the THEMIS Mission Robert E. McGuire SPDF/Code 612.4, NASA Goddard Space Flight Center Greenbelt MD 20771

  2. Major SECAA Services Today Relevant to THEMIS Science - 1 • Common Data Format (CDF) • Built on multi-dimensional conceptual view of data • Highly flexible, efficient file storage, high-performance data retrieval (hyperputs/gets), • Supports various modes of internal compression • Data Translation Web Service (DTWS) now available • SSCWeb • Multi-mission orbits for coordinated science planning and retrospective analysis • Listing & display in mapped coordinates and by regions of geophysical space • Plus 3-D interactive displays • Time spans of region and magnetic conjunctions • Both spacecraft-spacecraft and with ground stations • Includes all recent satellites of S3C interest (33+) and many ground stations • CDAWeb • Simultaneous data from most instruments on most current (non-solar) S3C NASA and related missions 1992-2005 • Plus various ground-based experiments, selected holdings from some older missions • Easy data browse and display, user-specified time and parameter subsets with graphics, listings, file downloads

  3. TIMED data on CDAWeb Along-track zonal and meridional wind at selected heights

  4. Major SECAA Services Today Relevant to THEMIS Science -2 • Web Service Interfaces • API for Internet access to our working services from other software packages • Query capability to determine valid inputs and receive status messages • Foundation for our capability to serve middleware such as VxOs and new applications • CDAWeb Plus • CDAWeb-like Java client built on extended CDAS web services • Enables unified view of SECAA’s data and services to the level of each service • Pointers, combined file downloads, graphics and subsets • Software • CDF • CDAWLib and CDFX, CDAWeb • Translators • SkeletonEditor, MakeCDF • CDF and essentially all the above codes are Open Source under NOSA license

  5. CDF Current Status (details for breakout) • CDF 3.1 • Development underway. Schedule for release in January 2006 • Main features • Easy-to-use Standard Interface C & Fortran routines for zVariables (instead of Internal Interface) • Option for CDFs compatible with CDF 2.7 or earlier releases (via environment variable or API) • 64-bit CDF included in IDL 6.2 for AMD64 is not working properly • Fix will be included in the next IDL release (6.3), currently scheduled for late 1Q, 2006 • Working 64-bit CDF available at http://cdf/html/idl62_amd64_problems.html • CDF News • Next IDL release (6.3) scheduled for release in late 1Q, 2006 • Will include the latest CDF library (Version 3.1) • Matlab will support CDF 3.1 in about 6 months • Data Translation Web Service (DTWS) • Web client available at http://translators.gsfc.nasa.gov • Allows to translate one or more local and/or remote files (up to 10 files at a time) • Can be called within applications (see http://cdf.gsfc.nasa.gov/html/dtws.html for details) • Individual data translators (both source and binary) are available at http://cdf.gsfc.nasa.gov/html/dtws.html

  6. SPDF/SECAA Services are Used by the Community • Figure represents system executions (not just web “hits”) • Another metric is the number of distinct users (or distinct IP addresses) executing services • Most easily available for CDAWeb, e.g. period July 1, 2004- June 30, 2005 • ~290 distinct addresses made >100 requests during the year, ~1300 distinct addresses made >10 requests

  7. How Can SECAA Contribute to the THEMIS Science Effort? • THEMIS is using CDF as a base for its ground processing • I hope to talk about details, progress, needs in the afternoon breakouts • Is CDF support needed for other format translations, in other s/w packages? • We plan to add the THEMIS spacecraft orbits to SSCWeb when launched • I hope to talk about mechanics of getting orbit data in the afternoon breakouts • Are there new orbit graphics or models needed for THEMIS support? • Are there predictive orbits that would be useful or interesting in SSCWeb sooner? • Data we now serve via Web Services is available for THEMIS to build from • We would be pleased to serve appropriate THEMIS in e.g. CDAWeb • To add complementary value and increase usefulness of THEMIS data • Make data available through web services (SOAP, REST) as well as FTP, HTTP • To better enable science use of THEMIS data in context of data from other missions • THEMIS adds to the science utility of the combined data collection • Work with THEMIS group to set up appropriate/complementary graphics (cf. TIMED) • Are there other housekeeping (cf. IMAGE), ground or other data needs? • Open to discuss alternative/different approaches and other needs • E.g. more distributed technical solutions and other partnering

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