November 4, 2010
EVALSO: A New High-speed Data Link to Chilean Observatories
Stretching 100 kilometers through Chile's harsh Atacama Desert, a newly inaugurated data cable is creating new opportunities at ESO's Paranal Observatory and the Observatorio Cerro Armazones. Connecting these facilities to the main Latin American scientific data backbone completes the last gap in the high-speed link between the observatories and Europe.
This new cable is part of the EVALSO (Enabling Virtual Access to Latin American Southern Observatories) project , a European Commission FP7  co-funded program coordinated by the University of Trieste that includes ESO, Observatorio Cerro Armazones (OCA, part of Ruhr-Universität Bochum), the Chilean academic network REUNA and other organizations. As well as the cable itself, the EVALSO project involves buying capacity on existing infrastructure to complete a high-bandwidth connection from the Paranal area to ESO's headquarters near Munich, Germany.
The sites of Paranal and Armazones are ideal for astronomical observation due to their high altitude, clear skies and remoteness from light pollution. But their location means they are far from any pre-existing communications infrastructure, which until now has left them dependent on a microwave link to send scientific data back to a base station near Antofagasta.
Telescopes at ESO's Paranal observatory produce well over 100 gigabytes of data per night, equivalent to more than 20 DVDs, even after compressing the files. While the existing link is sufficient to carry the data from the current generation of instruments at the Very Large Telescope (VLT), it does not have the bandwidth to handle data from the VISTA telescope (Visible and Infrared Survey Telescope for Astronomy, or for the new generation of VLT instruments coming online in the next few years.
This means that for much of the data coming from Paranal, the only practical way to send it to ESO Headquarters has been to save it onto hard drives and send these by airmail. This can mean a wait of days or even weeks before observations from VISTA are ready for analysis.
Even with this careful rationing of the connection and sophisticated data management to use the connection as efficiently as possible, the link can get saturated at peak times. While this causes no major problems at present, it indicates that the link is reaching capacity.
ESO Director General Tim de Zeeuw said: "ESO's observatory at Paranal is growing, with new telescopes and instruments coming online. Our world-class scientific observatories need state-of-the-art infrastructure."
In the place of the existing connection, which has a limit of 16 megabit/s (similar to home ADSL broadband), EVALSO will provide a much faster 10 gigabit/s link "” a speed fast enough to transfer an entire DVD movie in a matter of seconds .
Mario Campolargo, Director, Emerging Technologies and Infrastructures at the European Commission, said: "It is strategically important that the community of astronomers of Europe gets the best access possible to the ESO observatories: this is one of the reasons why the European Union supports the deployment of regional e-infrastructures for science in Latin America and interlinks them with GÃ“°ANT  and other EU e-infrastructures."
The dramatic increase in bandwidth will allow increased use of Paranal's data from a distance, in real-time. It will allow easier monitoring of the VISTA telescope's performance, and quicker access to VLT data, increasing the responsiveness of quality control. And with the expanded bandwidth, new opportunities will open up, such as astronomers and technicians taking part in meetings via high-definition videoconferencing without having to travel to Chile. Moreover, looking forward, the new link will provide enough bandwidth to keep up with the ever-growing volumes of information from Paranal and Armazones in future years, as new and bandwidth-intensive instruments come into use.
Immediate remote access to data at a distant location is not just about saving money and making the observatory's work more efficient. For unexpected and unpredictable events, such as gamma-ray bursts, there is often not enough time for astronomers to travel to observatories, and EVALSO will give experts a chance to work remotely on these events almost as if they were at the observatory.
 EVALSO is funded under the European Commission FP7 and is a partnership among Universita degli Studi di Trieste (Italy), ESO, Ruhr-Universität Bochum (Germany), Consortium GARR (Gestione Ampliamento Rete Ricerca) (Italy), Universiteit Leiden (Netherlands), Istituto Nazionale di Astrofisica (Italy), Queen Mary, University of London (UK), Cooperacion LatinoAmericana de Redes Avanzasas (CLARA) (Uruguay), and Red Universitaria Nacional (REUNA) (Chile).
 FP7 (the European Commission Seventh Framework Programme for Research and Technical Development) is the European Union's main instrument for funding research. Its aim is to make, or keep, the EU as a world leader in its priority areas in science and technology.
 The newly laid cable has a bandwidth of 10 gigabit/s. The entire network infrastructure between Paranal to ESO HQ in Germany is theoretically capable of transferring data at a maximum of 1 gigabit/s.
 GÃ“°ANT is a pan-European data network dedicated to the research and education community. It connects 40 million users across 40 countries.
ESO, the European Southern Observatory, is the foremost intergovernmental astronomy organization in Europe and the world's most productive astronomical observatory. It is supported by 14 countries: Austria, Belgium, the Czech Republic, Denmark, France, Finland, Germany, Italy, the Netherlands, Portugal, Spain, Sweden, Switzerland and the United Kingdom. ESO carries out an ambitious program focused on the design, construction and operation of powerful ground-based observing facilities enabling astronomers to make important scientific discoveries. ESO also plays a leading role in promoting and organizing cooperation in astronomical research. ESO operates three unique world-class observing sites in Chile: La Silla, Paranal and Chajnantor. At Paranal, ESO operates the Very Large Telescope, the world's most advanced visible-light astronomical observatory and VISTA, the world's largest survey telescope. ESO is the European partner of a revolutionary astronomical telescope ALMA, the largest astronomical project in existence. ESO is currently planning a 42-meter European Extremely Large optical/near-infrared Telescope, the E-ELT, which will become "the world's biggest eye on the sky".
Image 1: Guests and VIPs gather at the inauguration of the EVALSO (Enabling Virtual Access to Latin American Southern Observatories) project. This new communications infrastructure gives ESO's Paranal Observatory, and Ruhr-Universität Bochum's Cerro Armazones Observatory a high-capacity link to send observational data back to Europe. Credit: ESO
Image 2: EVALSO (Enabling Virtual Access to Latin American Southern Observatories) is a new communications infrastructure supporting ESO's Paranal Observatory. The construction of the main 100km long data cable (pictured) took place in the harsh conditions of the Atacama Desert. This new link gives ESO's Paranal Observatory, and Ruhr-Universität Bochum's Cerro Armazones Observatory a high-capacity connection to send observational data back to Europe. Credit: ESO
On the Net: