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**"AMDA and CLWeb: Complementary Spacecraft Data Services"**

Learn about AMDA and CLWeb, two web-based services for spacecraft data exploitation, offering statistical analysis, detailed data analysis, and time-table creation. The services, hosted in France, aim to archive and make data accessible for research and scientific endeavors.

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**"AMDA and CLWeb: Complementary Spacecraft Data Services"**

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  1. AMDA and CLwebTwo complementary web-based services for spacecraft data exploitation Benoit Lavraud, on behalf of: The CDPP / IRAP team: (C. Jacquey, V. Génot, E. Budnik, N. André, M. Bouchemit, M. Gangloff, B. Lavraud) The SWEA / IRAP team: (J.-A. Sauvaud, E. Penou, A. Opitz, A. Fedorov, P. Louarn, B. Lavraud) CESR, Toulouse, France with help from LESIA and support from CNES and CNRS

  2. Why complementary? • AMDA: • Mainly uses basic datasets for given mission • Allows statistical analyses (searches) • Creates Time-Tables (event lists) • CLWeb: • Uses all products from instruments/missions • Allows detailed data analysis (distribution functions, HKP data, modes, etc.) • Uses Time-Tables Link: Time-Tables

  3. CDPP : http://cdpp.cesr.fr • French national centre (CNRS-CNES) > 10 years • Hosted at CESR, Toulouse, France • Missions: • Archiving data for long-term preservation • Data valorisation • Making data easy to use • Providing tools and services • Participation to Virtual Observatories

  4. AMDA : http://cdpp-amda.cesr.fr Visualisation editor • Web-based public service (in operation for ~3 years) • Registered or “guest” access • Transparent (automated) access to data •  users play with parameters, not files • AMDA local database : STEREO, CLUSTER, ACE, THEMIS, GEOTAIL, WIND, …, VEX, MEX, …, IMP-8, ISEE, … geo. indices • External databases : CDAWeb, CASSINI, VEX-MAG, THEMIS/CESR, … • Produces and exploits Time-Tables (event lists) •  Helps to make science ! Download data Parameter editor External data Visual search Conditional search Time-Table manager

  5. AMDA basics • - Parameters (scalar, vector, …) • Density • Indices • Magnetic/velocity vector • Flux in a given energy band • - … stored as xml files with • Resolution • Start-Stop times • - … which the user manipulates : • New parameters • Plots/visualizations • Searches & Time-Tables • Downloads • - File architecture hidden to the user 17/11/1994 31/12/2005 Sampling 4s

  6. AMDA time tables • - Lists of time intervals : Start – Stop • - Obtained : • Visually : the user selects intervals by mouse click on a plot • From a mathematical condition imposed on data content • Up-loaded from user disk or from URL • - Stored in txt or xml VOTable format • - SPASE descriptor can also be provided • - Time tables are also used in QSAS (Imperial College, UK) and CLWeb (CESR, France)

  7. AMDA: HCS detection use-case

  8. Build new parameters

  9. Save and re-use them

  10. HCS: Param<0

  11. Conditional Search

  12. Manipulate Time-Tables

  13. Plot only for TTs

  14. Refine orcreate newTime-Tables Magneticsector boundary True sector boundary

  15. My own Time-Tables • Operations on TTs • Share TTs • Download TTs • Upload TTs • All shared TTs

  16. CLweb: Detailed data analysis

  17. Various menus Electron PAD

  18. May use HCS TT from AMDA and study details of PADs or BURST mode data

  19. Detailed BURST data analysis with CLweb Reconnection exhaust at an HCS 2 minutes

  20. Using time-tables Load Time-Table >>> >>> CL … CAA Tools QSAS Time-Table Start Time – Stop Time – number Start Time – Stop Time – number Start Time – Stop Time – number Start Time – Stop Time – number …. CDAWeb SUPERDARN APL server DARTS • Requirements: • A Time-Table format standard Collaboration CDPP/CAA/QSAS/CL: VOtable http://cdpp2.cesr.fr/twiki/bin/view/AMDA/AmdaTimeTableFormat • An interface for reading the standardised Time-Tables • A web interface module to skip from one time interval to another one • Further notes on AMDA: • IDL/Matlab routines for reading TTs available on web site • The site explains how to access data through web-services • To register, just send an email to amda@cesr.fr • Free CDPP stickers for the first, next 10 to register !!!

  21. Conclusions • From the above, the scientific interest for such tools is evidenced • Complementarities of tools is important : it mutually enhances efficiency and usefulness • Would take much more time to scientists to produce such results on their own • It creates a community of user (ex: Time-Tables sharing) • User feedback is needed and encouraged!

  22. Perspectives • Need for more standardization (including simulation databases) • Need for more implication of scientists : Virtual Observatories subject is not a sole “technical” thing. New tools and services must be science-triggered and tested by scientists • Need for diversification : time series are not the only class of objects which could be manipulated (images, maps, …) • Need for conferences/places to disseminate these activities •  Messenger cruise B-field cruise data will be in AMDA in April •  Heliophysics studies: STEREO, VEX, MESSENGER, CASSINI, Earth, remote access to CDAWEB, and more in future…

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