Further Observations of Space Shuttle Plasma-electrodynamic Effects from Oss-1/sts-3

Recent analyses of ion measurements band electrostatic noise observed in the frequency obtained from the Differential Ion Flux Probe range of 30 Hz to 178 kHz [Shawhan et al., 1984]. (DIFP) on the deployed Plasma Diagnostics Package The Differential Ion Flux Probe (DIFP), used (PDP) during the OSS-1/STS-3 mission have provided for the ion measurements, has been described in an additional insight into the plasma-electrodyStone [1977] and Stone et al. [1985]. Briefly, namics of the Space Shuttle Orbiter: (1) Measured this instrument has the capability to deconvolve ion flow directions and energies suggest that the disturbance created in the ionospheric plasma by the Shuttle Orbiter may be confined to an interaction region that extends on the order of 10 m in the forward direction and has a boundary thickness of about 2 m. (2) A correlation between the DIFP and pressure gauge measurements indicates a direct, local proportionality between the neutral gas and ion densities. (3) Preliminary results from a theoretical model of the possible interaction between measured secondary, high inclination ion streams and the ambient plasma indicate the generation of broad-band electrostatic noise such as that observed by wave instruments on the PDP.