with the Facility "ON" and 15.1 + 0.90 dB with the Facility "OFF". Data taken on different days and data observed'on the LORAN-C and AM broadcast stations show no change in the performance of VLF, LF, and MF systems that can be associated with operation of the Satellite Power System. The experimental program geared toward assessing the physical phenomenon involved in ionospheric/microwave beam interactions relies heavily upon the Arecibo Facility. It is anticipated that this Facility will be supplying SPS comparable power density to the ionosphere in the near future. Theoretical studies have been directed toward developing predictive models of the ionosphere that include the effects of enhanced electron heating in the D region and thermal seif-focusing in the F region. The SPS Ionospheric Disturbance program involves the expertise of a number of individuals and organizations. The organizations actively participating in the assessment are listed in Table 1. The program is directed toward assessing the degree to which the operation of the SPS will modify the ionosphere and impact upon the performance of telecommunication systems.
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