EFFECTS ON SPACE VLBI The likelihood that space VLBI systems will be operating in the not-too- distant future requires consideration of a slightly different sort. The effects on the VLBI system are identical to those considered for the ground-based systems. The difference is that in the search for better angular resolutions the laws of electromagnetism require one to go to large distances from the earth. Therefore, the receiving system will be closer to the source of interference, and the flux densities will be larger. To some extent, one can alleviate the effect by choosing orbits for the orbiting VLBI system that avoid proximity to the power satellites, but one can easily see that the VLBI systems at times would be 2 to 10 times closer to the SPS transmitter than for the ground-based case. The tolerable fluxes will be lowered, therefore, by the effects of the inverse-square law, and would be 6 to 20 dB below the levels specified in the first two sections.
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