Interplanetary (IP) type III bursts that undergo sudden intensity changes when their electron beams traverse the vicinity of an IP shock are examined. Three types of intensity changes are discussed: cutoffs in which the type III intensity is abruptly reduced and remains at the reduced level for all lower frequencies, narrow-band intensifications that frequently occur on the high-frequency edge of a cutoff, and narrow-band intensity reductions. Pitch angle scattering of the beam electrons in the enhanced magnetic turbulence downstream of shocks is proposed as a principal cause of the intensity cutoffs and, possibly, the intensifications. These observations suggest that one type III emission mode (fp or 2fp) is frequently at least 10 times more intense than the other mode. 10 times above the background level.-(Lin-et ai., 1986). Enhanced background levels m•y reduce the Langmuir wave amplification by diminishing the.. velocity extent of the' bUmp-on-tail. Turning to the NBI's, it seems .pro.bable •that the region in which they occur has an angular extent COrresponding t ø tha t'•of no. rmal•: • .:ype. Ill ß 'emission and a radial extent of order 0.1 •o 0.3 of the distance R to the Sun. If the enh'•inced emission came from a• region significantly narrower '(or, wider• '• than the normal" type III -angUlar Wid•hi one would detect changes in position a'nd.søUrc• size, which are not observed (MacDowall; 1988). "Normal" type III emission in a bandwidth-•M/f of" order 0.3 would be produced in a region of radial extent fiR/R~0.3 due to the approximate inverse re-Phys., 46, 461-464, 1976. Fainberg, J., S. Hoang, and R. Manning, Measurements of distributed polarized radio sources from spinning spacecraft; effect of a tilted axial antenna. ISEE-3 application and results, Astron. Astrophys., 153, 145-150, 1985. Kennel, C.F., et al., N'•'•ocal plasma turbulence associated with interplanetary shocks, J. Geophys. Res., 87, 17-34, 1982. Knoll, R., et al., The 3-dimensional radiomapping experiment (SBH) on ISEE-C, Trans. Geosci. Electronics, GE-16, 199-204, 1978. Lacombe, C. and B. Moller-Pedersen, Interaction of a collisionless shock wave and a stream of particles in the upper solar corona, Astron. Astrophys., 15, 406-418, 1971. Lengyel-Frey, D. and R.G. Stone, Characteristics of interplanetary type II radio emission and the relationship to shock and plasma parameters, Geophys. Res., 94, 159-167, 1989. Lin, R.P., Energetic solar electrons in the interplanetary medium, Solar Phys., 100, 537-561, 1985. Lin, R.P., et al., Evidence for nonlinear wave-wave interactions in solar type III radio bursts, Astrophys. J., 308, 954-965, 1986. MacDowall, R.J., Kilometric type III radio bursts and interplanetary transients, Ph.D. dissertation, 145 pp., Melrose, D.B., Plasma Astrophysics -Nonthermal processes in Diffuse Magnetized Plasmas, Vol. 2, 423 pp., Gordon and Breach, New York, 1980. Reiner, M.J. and R.G. Stone, Model interpretation of type III radio burst characteristics I. Spatial aspects, Astron. Astrophys., 206, 316-335, 1988. Sawant,...