Radiometer Workshop Collocation in Wettzell Why are we here

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Radiometer WorkshopCollocation in WettzellWhy
are we here?

• Universität der Bundeswehr, Neubiberg
• 26.07.05

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Motivation

• CONT05
• Continuous VLBI observation in 2005 state of the
  art
• Previous observations CONT02, CONT96, CONT95,
  CONT94
• CONT05 Period September 12- 27, 2005
• 12 VLBI sites
• Algonquin/Canada Fortaleza/Brasilia
• Gilmore Creek/USA HartRA/South Africa
• Kokee Park/USA Ny Alesund/Norway
• Onsala/Schweden Svetloe/Russia
• TIGO/Chile Tsukuba/Japan
• Westford/USA Wettzell
• Contributions from IGS and ILRS
• Water Vapour Radiometer collocated at VLBI
  Observatories

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Radiometers available

• Onsala, Gunnar Elgered
• TIGO, ETH-radiometer
• Wettzell, ETH-radiometer and Radiometrics(TU-Dresd
  en)
• Kokee Park, Radiometrics -Univ. BW?)
• Westford - Radiometrics Canada?
• HartRAO ETH radiometer ?
• ???

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What do we expect from the Radiometers?

• 2002 RADCALWET, Collocation in Wettzell
• 3 ETH systems,
• 2 Radiometrix systems
• Calibration with liquid Nitrogen
• Results
• Good agreement Radiometrix, 3mm WZD
• Unknown offsets ETH type systems, instable, needs
  improvements

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Collocations 2005

• Period started April 11, 2005 at Wettzell
• 3 ETH-systems
• 2 from BKG-FSW
• 1 from ETH Zurich
• 2 Radiometrics
• Univ. BW
• BKG-FSW long term loan from TU Dresden
• Sun spectrometer from ETH
• Radiosonds launched with balloons
• VLBI observations R1 and R4 analysed by TU-Vienna
• GPS observations analysed by IGS
• Period started July 11, 2005 at Effelsberg
• MPI-Radiometer, Radiometrics, ETH-Radiometer

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Collocation in April 2005
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Radiometrics and ETH Radiometer
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Sun Spectrometer
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Balloon launches
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CollaborationThanks for the contributions

• Univ. BW H. Heister, P. Häfele
• ETH-Zurich B. Bürki, A. Somierski
• BKG-FSW W. Schwarz, Chr. Plötz,
• St. Riepl, W. Schlüter
• MPIfR A. Roy, H. Rottmann,
• U. Teuber
• IRAM M. Bremer
• HartRAO L. Combrinck, A. Combrinck