ESA Archives and VO Tools:
Without Frontiers
The Science Archives and VO Team (SAT), at ESAC, is incharge of the challenging task of developing tools for easy,
fast and friendly access to scientific data.
Scientific applications developed by the SAT arecontinuously evolving under the ideas of:- Common architecture- Quick building- Flexibility- Extensibility- Interoperability- Easy maintenance
The resulting infrastructure isreusable for a wide varietyof space based missions.

Top Level Architecture of new archives
generation

Archives

Communications
among different
services using
message brokers
allows users tostudy scientific data
through suitable
analysis tools.

SAT implementsinteroperatibility
solutions among
tools using the IVOASAMP protocol.

VO Tools
Images fromSOHO
displayed in
Aladinvisualization
tool.

SAMP is amessaging protocolthat enables
astronomy softwaretools to interoperateand communicate.

ESA VO
http//esavo.esac.esa.int
http//esavo.esac.esa.int

Spire spectra
displayed in
VOSpec, theESA-VO tool for
handling
spectra.

Highly Distributed Data
Scientific tools developed within thecontext of interoperability and highly
distributed data must be ready to deal withuneven data coming from different
services.

In the case of spectral analysis tools
this implies dealing with data comingfrom different sources, at different
wavelengths, with different
resolutions,…
SAT develops many VO tools. As an
example of the progress of these tools
within the context of interoperability we
present Best Fit. This application is
integrated in VOSpec.
Best Fit helps us to find the theoreticalmodel (from TSAP server) that best fitsa given Spectral Energy Distribution(from SSAP server/s).

The best model is the modelthat achieves the global
minimum of the Chi-squarefunction.

SAT has undertaken
the effort to build stateof the art sub-systems
for a new generation ofarchives.
This new technology
has already been
applied to the creationof SOHO and EXOSAT
science archives.
The development ofarchives for suchdifferent missions
shows clearly theflexibility andadaptability of theresulting
infrastructure.
SOHO and EXOSAT, have been developed as
prototypes of the new SAT archives
generation.

EXOSATarchive will be
public verysoon.

One important objective of the SATgroup is to implement
interoperability solutions amongservices.

SOHO archive sends
images to any VO SAMP
compatible application.
Coming soon: we will beable to send also SOHO 1D
spectra to VOSpec.

To solve this minimization
problem this tool uses a
modified version of theiterative LevenbergMarquardt method.
TSAP server and initial
parameters are selected bythe user.
Chi-squared
values andparameters areshown in thefitting window
for every stepduring theminimization
process.
If the best fit model isfound, the user can choose
to load and view it in thedisplay window.

Herschel Interactive Processing
Environment (HIPE) is already integrated
with VOSpec.
First Herchel spectra (SPIRE spectra)
have been displayed.

SOHO Science Archive
http://soho.esac.esa.int/data/archive/index_ssa.html
http://soho.esac.esa.int/data/archive/index_ssa.html
EXOSAT Science Archive (coming soon)
http://www.sciops.esa.int/index.php?project=SAT
http://www.sciops.esa.int/index.php?project=SAT

European Space Astronomy Centre (ESAC) - Villafranca del Castillo, MADRID (SPAIN)
4-8 October
2009
ADASS XIX
Sapporo

SOHO archive
has became
publicrecently.

A. Laruelo, C. Arviset, D. Baines, I. Barbarisi, J. Castellanos, N. Cheek,
H. Costa, N. Fajersztejn, M. Fernandez, J. Gonzalez, I. Leon, I. Ortiz,
P.Osuna, J. Salgado, A. Stebe, D. Tapiador