EVLBI at Wettzell R. Dassing G. Kronschnabl. Wettzell is a Fundamentalstation for Geodesy (i.e. all relevant geodetic measurement systems are collocated.

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Presentation transcript:

eVLBI at Wettzell R. Dassing G. Kronschnabl

Wettzell is a Fundamentalstation for Geodesy (i.e. all relevant geodetic measurement systems are collocated there: VLBI, SLR, GPS, DORIS, Seismometer, Gravimeter, RingLaser) Wettzell is a Fundamentalstation for Geodesy (i.e. all relevant geodetic measurement systems are collocated there: VLBI, SLR, GPS, DORIS, Seismometer, Gravimeter, RingLaser) geodetic VLBI measurements are performed since 1983 geodetic VLBI measurements are performed since 1983 Wettzell's VLBI is part of IVS Wettzell's VLBI is part of IVS

Since 2004: optic fibre based, 34 Mbps connection to Wettzell Costs/year: ~ ,- € („flat rate“ for uploading) eVLBI - INTERNET connection of Wettzell Wettzell

Since April 2005: Int2 (Saturday, Sunday) between Wettzell and Tsukuba (Japan) is completely executed by eVLBI as a disk to disk transfer: the data stored locally on a MARK5A System The Data is get and recorded by Tsukuba 2 hours after each session automatically via FTP. 1 day after observations, they are correlated! eVLBI - Usage for VLBI  Gain of days with respect to the traditional method, i.e., snail mail  One of the first scheduled eVLBI observation in IVS

eVLBI - Usage for VLBI This graph shows the INTERNET usage of Wettzell in June The green bars demonstrate the outgoing TCP/IP packets. The eVLBI usage can clearly be seen on Saturdays and Sundays.

For Wettzell, the daily INT observations are suitable candidates for eVLBI. eVLBI - Future Plans Candidates for further eVLBI based sessions: ~ 2 h~ 10 h~ 30 h155 Mbps ~ 5 h~ 30 h~ 100 h34 Mbps INT (36,68 Gbyte) R4 (~ 280 Gbyte) R1 ( ~ 1.1 Tbyte) Bandwidth (60% efficiency)

eVLBI - Future Plans  As soon as we can show that eVLBI is working on a regular basis, we may request for higher bandwidth  We strongly encourage the IVS to make use of eVLBI especially for INT1 Connection costs are ~ ,- €/a for 155 Mbps

eVLBI - Summary VLBI radiotelescope at Wettzell is now connected to the INTERNET with 34 Mbps. Since April 2005, Wettzell is performing eVLBI observations for INT2 in a regular basis. The data are transfered to Tsukuba, and one day after the observations, the results of the observations are produced. We gain days with eVLBI As soon as all INT observations are transfered via INTERNET, we may ask for higher bandwidth to the INTERNET.