Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984clai.agarr....s&link_type=abstract
In AGARD Characteristics of the Lower Atmosphere Influencing Radio Wave Propagation 8 p (SEE N84-24943 15-32)
Astronomy and Astrophysics
Astronomy
Ionospheric Propagation, Radio Astronomy, Radio Wave Refraction, Very Long Base Interferometry, Calibrating, Comparison, Errors, Radio Telescopes
Scientific paper
Radio astronomical observations with local interferometers and very long baseline interferometers (VLBI) are affected by atmospheric (i.e., tropospheric and ionospheric) refraction. A correction procedure for ionospheric refraction for radio astronomy interferometry is reviewed. This correction is applied to observations made with the Westerbork Synthesis Radio Telescope (WSRT). The method used for WSRT observations can also be used to correct VLBI observations for ionospheric refraction. If networks of ionosonde and satellite observing stations operate during the astronomical VLBI observations, pathlength corrections ranging from several wavelengths to a fraction of a wavelength are possible, provided the geographical distribution of these stations is similar to the VLBI network. The possibilities of this procedure are compared with the results derived by e.g., dual frequency VLBI observations.
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