Investigating the VLBI scale behavior
- 1Chalmers University of Technology, Department of Space, Earth and Environment, SE-43 992 Onsala
- 2Lantmäteriet – The Swedish Mapping, Cadastral, and Land Registration authority, Lantmäterigatan 2C, SE-801 82 Gävle
Preliminary results of the ITRF2020 show that the Very Long Baseline Interferometry
(VLBI) solution appears to have a scale problem, with larger scatter of the scale factor and a
potential scale drift after around 2014. There are several possible reasons that have been
brought into discussion, ranging from specific VLBI stations having technical problems to
the use of various geophysical models in the VLBI data analysis, such as atmospheric
pressure loading and post-seismic deformation models, and other models to account for, e.g.,
thermal and gravitational deformation of radio telescopes. This work focuses on the impact of
such reasons on the VLBI scale. We first investigate the VLBI contribution of the Onsala
Observatory which made used of the software package ASCOT and that enters in the IVS
combined solution, and we then expand to the IVS combined solution and other individual
contributions.
How to cite: Le Bail, K., Nilsson, T., Haas, R., and Nyström Lindé, F.: Investigating the VLBI scale behavior , EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-13464, https://doi.org/10.5194/egusphere-egu22-13464, 2022.
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