From subarcsec-seeing infrared images and spectra in the K and H bands, we present reflectivities and limb-darkening results for two of the hazy regions generated during the SL-9 collision. These highly reflective impact areas at infrared methane wavelengths have been studied in terms of multiple scattering radiative models. The results for both the H and D/G impact remnants show that a considerable amount of particles have been injected in Jovian stratospheric levels from ~1 mbar to the upper level of the assumed Jovian tropospheric NH3 ice haze (at ~350 mbar). Our models suggest a concentration of small particles, with mean radius of 0.15 &mgr;m for a real refractive index of 1.7. The imaginary refractive indices are in the range 1¿10-4 to 1¿10-3. For the H impact region, absorption at 2.0 &mgr;m is enhanced compared to unperturbed regions at the same scattering geometry. This enhancement is not observed in the older D/G complex. ¿ American Geophysical Union 1995