SATURN'S RINGS ON THE EDGE. SATURN'S RINGS PROVIDE AN ACCESSIBLE NATURAL LABORATORY FOR OBSERVING DISK-PARTICLE INTERACTIONS WHICH ARE ALSO AN IMPORTANT ASPECT OF THE EVOLUTION OF DISKS AROUND OTHER STARS WITH APPLICATIONS TO THE ORIGIN OF OUR OWN SOLAR SYSTEM. THE PRESENT PROPOSAL FOCUSES ON RING PROCESSES AS PARTICULARLY ILLUMINATED BY THE 2009 SATURNIAN EQUINOX EVENT DURING WHICH THE SUN SHONE UPON THE RINGS EDGEON. AS A RESULT THE DENSITY VARIATIONS THAT USUALLY DOMINATE THE RINGS' VISUAL ASPECT WERE SEVERELY WASHED OUT AND VERTICAL STRUCTUREOF ALL KINDS WAS PROMINENTLY HIGHLIGHTED. WORK THAT WE PROPOSE TO UNDERTAKE INCLUDES: - SPIRAL WAVES: AS PART OF OUR ONGOING WORK TO CHARACTERIZE QUASI-PERIODIC RADIAL STRUCTURE IN THE RINGS WE WILL TAKE ADVANTAGE OF THE EQUINOX DATA AS A UNIQUE OPPORTUNITY TO DISENTANGLE IN-PLANE MOTIONS FROM OUT-OF-PLANE MOTIONS. SINCE RADIAL DENSITY VARIATIONS (DUE TO IN-PLANE MOTIONS) BECAME INVISIBLE DURING THE EQUINOX EVENT COMPARING EQUINOX IMAGES TO NON-EQUINOX IMAGES WILL ALLOW US TO UNIQUELY IDENTIFY VERTICAL STRUCTURE (DUE TO OUT-OF-PLANE MOTIONS). THE RESULT WILL BE TO DISENTANGLE THE TWO TYPES OF STRUCTURE AND IN SOME CASES TO IDENTIFY VERTICAL STRUCTUREWHERE IT IS USUALLY ENTIRELY INVISIBLE OBTAINING A THREE-DIMENSIONAL VIEW OF THE RINGS. - GAP EDGES: AS PART OF OUR ONGOING WORK TO CHARACTERIZE THE IRREGULAR STRUCTURE IN THE EDGES OF THE ENCKE AND KEELER GAPS WE WILL TAKE ADVANTAGE OF THE EQUINOX DATA AS A UNIQUE OPPORTUNITY TO DISENTANGLE VERTICAL (SCALLOPED) FROM HORIZONTAL (WAVY) EDGE STRUCTURE. - IMPACT EJECTA CLOUDS: LARGE SHEARING DUSTCLOUDS CONSISTENT WITH IMPACT EJECTA EVOLVING UNDER KEPLERIAN SHEAR WERE SEEN DURING THE EQUINOX EVENT. THOUGH THEIR EXISTENCE WAS UNEXPECTED THEIR VISIBILITY IS READILY EXPLAINED BY THE EQUINOX GEOMETRY. WE PROPOSE TO FULLY CHARACTERIZE THESE OBSERVED STRUCTURES LEADING TO INFERENCES REGARDING THE OUTER SOLAR SYSTEM'S INTERPLANETARY MICROMETEROID POPULATION AND THE PARTICLE-SIZE DISTRIBUTION OF EJECTA RESULTING FROM IMPACTS ONTO RINGS. IF SELECTED THE PARTICIPATING SCIENTIST PORTION OF THIS PROPOSAL WILL ENTAIL A BROADER FOCUS ON THE DYNAMICS OF SATURN'S DENSE RINGS.