Abstract
Radio astronomical observations with local interferometers and very long baseline interferometers (VLBI) are affected by atmospheric (i.e. tropospheric and ionospheric) refraction. A procedure to correct VLBI observations for ionospheric refraction using simultaneous ionospheric measurements is outlined. If networks of ionosonde and satellite observing stations operate during the astronomical VLBI observations, pathlength corrections ranging from several times the VLBI observing wavelengths to a fraction of this wavelength using the simultaneously collected ionospheric data are possible, provided that the geographical distribution of these ionosphere stations is similar to the VLBI network.
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