The Navy's proposed extremely low frequency (ELF) communications system (Sanguine), which would use an earthreturn circuit to excite the earth-ionosphere cavity, represents a potential electrical interference problem. The electromagnetic fields produced by Sanguine could influence other systems such as power distribution lines and telephone circuits, and other very long electrical conductors. This interference potential and the techniques useful in mitigating it are described. Also, data on power and telephone systems are presented that were useful in communications systems design tradeoff studies.

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They were selected to portray. specific SPS/COEP issues and interests, and. should not be used to correlate•. with other bibliographies. It should be recognized that the practical limit-of six key words.should not lead the user to presume that no other information is•included 1n. a particular document. The six key words do highlight the most defini•tive information in a document, however. Acquisition Number and Sources .Acquisition numbers are included for each citation. Multiple acquisition number•s should be used (where listed) when• requesting• documents from identified sources.•. ;.x .•. ATMOS.PHERIC EFFECTS Documents in this subject category cover potential atmospheric effects which mjght be produced by SPS launch and space vehicle exhaust effluents, microwave power transmission and rectenna operations. lhe effects of the atmosphere on SPS parameters also are included in this category,as are docuJ:~~ents which describe atmospheric characteristics and effects• of other space activities on the atmosphere.

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