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

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

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

• 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

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

17/11/199431/12/2005Sampling 4s

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)

AMDA:

HCS detection use-case

Build new parameters

Save and re-use them

HCS:Param<0

ConditionalSearch

Manipulate Time-Tables

Plot onlyfor TTs

Refine orcreate newTime-Tables

True sector boundary

Magneticsector boundary

My own Time-Tables

Operations on TTs

Share TTs

Download TTs

Upload TTs

All shared TTs

CLweb:

Detailed data analysis

Various menus

Electron PAD

May use HCS TT from AMDA and study

details of PADs or BURST mode data

Detailed BURST data analysis with CLweb

2 minutes

Reconnectionexhaust

at an HCS

Using time-tables

Time-TableStart Time – Stop Time – numberStart Time – Stop Time – numberStart Time – Stop Time – numberStart Time – Stop Time – number

….

CLQSAS

CAATools

CDAWeb

SUPERDARNAPL serverDARTSRequirements:

A Time-Table format standardCollaboration CDPP/CAA/QSAS/CL: VOtablehttp://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.fr Free CDPP stickers for the first, next 10 to register !!!

…

ConclusionsConclusions

• 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!

PerspectivesPerspectives

• 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…