releases may enchance cloud cover. Although considerable uncertainty exists as to climatic effects arising from SPS-related perturbations in stratospheric and mesospheric composition, such perturbations are not expected to be highly significant. III.4 IVhy have only two years been allotted for atmospheric impact studies? No fixed time has been "allotted” to any of the SPS assessment activities. Current atmospheric impact studies are part of the Concept Development and Evaluation Program, which for administrative reasons is limited to three years. The planned studies in that time frame are to identify potential impacts on the atmosphere and to determine what is known and unknown about each impact. If, after considering all results of CDEP, it is decided to proceed further, the potential atmospheric impacts identified in CDEP will be addressed in greater depth and will continue until uncertainty regarding them has been reduced to a reasonable level. III.5 Will communication systems already in place be disrupted by SPS operations? Communications and other electromagnetic radiating systems must be designed and operated according to national and international rules and regulations for radio spectrum use. The SPS would have to satisfy these rules and regulations for compatible spectrum use, and where necessary, develop mitigating strategies to account for otherwise avoidable interference situations. Mitigating strategies can be (1) designed into new equipment, (2) followed in operating new equipment, or (3) applied to existing equipment with the users' agreement. Microwave energy from SPS could interface with the operation of communication and other electronic systems now in use. In the absence of mitigating strategies, SPS interference effects would most likely occur in space and within about 100 kilometers of rectenna sites. Effects on satellites in space can be prevented by appropriate design of the SPS microwave transmission system, by coordinated operations with other satellites, and by including filters and shielding in future satellite designs. Maximizing the distance between rectenna sites and taking advantage of the shielding provided by terrain features are two mitigating stategeies which could be used on earth. Interference effects which cannot be avoided by these techniques __ SPS Preliminary Environmental Assessment, DOE/ER-0021/1, October 1978, p. 32. 32SPS Preliminary Environmental Assessment, D0E/ER-0021/2, October 1978.
RkJQdWJsaXNoZXIy MTU5NjU0Mg==