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Published byThomas Miles Modified over 9 years ago
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AMDA and CLweb Two complementary web-based services for spacecraft data exploitation with help from LESIA and support from CNES and CNRS 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
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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
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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
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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 ! AMDA : http://cdpp-amda.cesr.fr Visualisation editor Parameter editor Download data Visual search External data Conditional search Time-Table manager
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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
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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)
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AMDA: HCS detection use-case
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Build new parameters
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Save and re-use them
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HCS: Param<0
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Conditional Search
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Manipulate Time-Tables
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Plot only for TTs
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Refine or create new Time-Tables True sector boundary Magnetic sector boundary
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My own Time-Tables Operations on TTs Share TTs Download TTs Upload TTs All shared TTs
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CLweb: Detailed data analysis
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Various menus Electron PAD
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May use HCS TT from AMDA and study details of PADs or BURST mode data
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Detailed BURST data analysis with CLweb 2 minutes Reconnection exhaust at an HCS
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Using time-tables Time-Table Start Time – Stop Time – number …. CL QSAS CAA Tools 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 Load Time-Table>>> 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.framda@cesr.fr Free CDPP stickers for the first, next 10 to register !!! …
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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!
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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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