BASED ON A COMBINATION OF NUMERICAL MODELLING AND CASSINI OBSERVATIONS WE PLAN TO STUDY THE EMISSION MORPHOLOGY OF ENERGETIC NEUTRAL ATOMS (ENAS) FROM TITAN'S ATMOSPHERE. THESE EMISSION PATTERNS CONTAIN AN ADMIXTURE OF INFORMATION ON THE PARTICLE DISTRIBUTION FUNCTIONS AND THE DRAPED MAGNETIC FIELD CONFIGURATION NEAR TITAN I.E. THE ENA IMAGES TAKEN BY CASSINI CAN BE REGARDED AS SNAPSHOTS OF TITAN'S PLASMA INTERACTION REGION ON A GLOBAL SCALE. IN THE FIRST PART OF THE PROJECT WE WILL SYSTEMATICALLY INVESTIGATE THE IMPACT OF THE DRAPED MAGNETIC FIELD NEAR TITAN ON THE ENA EMISSION PATTERN. THE STRUCTURE OF THE ELECTROMAGNETIC FIELDS NEAR TITAN IS DETERMINED BY ASYMMETRIES DUE TO LARGE PICK-UP ION GYRORADII AS WELL AS THE MOON'S CHANGING DISTANCE TO THE CENTER OF SATURN'S MAGNETODISK CURRENT SHEET AND ITS ORBITAL POSITION. THE ELECTROMAGNETIC FIELD CONFIGURATION NEAR TITAN WILL BE COMPUTED WITH AN ESTABLISHED HYBRID (KINETIC IONS FLUID ELECTRONS) MODEL OF THE MOON'S INTERACTION WITH SATURN'S MAGNETOSPHERIC PLASMA. FOR VARIOUS SETS OF UPSTREAM PLASMA/MAGNETIC FIELD CONDITIONS WE WILL THEN CALCULATE THE ENA EMISSION FLUX THROUGH A CONCENTRIC SPHERE AROUND TITAN. TO ISOLATE THE IMPACT OF THE DRAPED AND ASYMMETRIC FIELD CONFIGURATION NEAR TITAN WE WILL COMPARE THE RESULTS TO THE EMISSION PATTERNS CALCULATED FOR SPATIALLY HOMOGENEOUS ELECTROMAGNETIC FIELDS. WE WILL ALSO MODEL THE IMPACT OF SHORT-SCALE TIME VARIATIONS IN TITAN'S ELECTROMAGNETIC ENVIRONMENT ON THE TRAJECTORIES OF THE ENERGETIC PARENT IONS. THE SECOND PART OF THE PROJECT WILL FOCUS ON THE GENERATION OF SYNTHETIC ENA IMAGES FOR SPECIFIC TITAN FLYBYS AND THEIR COMPARISON AGAINST IMAGES TAKEN BY THE CASSINI ION AND NEUTRAL CAMERA (INCA). IN THIS WAY WE SHALL CONSTRAIN THE POTENTIAL OF ENA OBSERVATIONS TO CHARACTERIZE THE VARIOUS ASYMMETRIES OF TITAN'S INDUCED MAGNETOSPHERE ON A GLOBAL SCALE. THE MAGNETIC FIELD OUTPUT FROM THE HYBRID MODEL WILL ALSO BE COMPARED AGAINST CASSINI MAGNETOMETER DATA THEREBY SIMULTANEOUSLY CONSTRAINING THE ASYMMETRIES OF TITAN'S INDUCED MAGNETOSPHERE ON A LOCAL SCALE. STATEMENT OF RELEVANCE: THIS PROJECT WILL SIGNIFICANTLY ENHANCE OUR UNDERSTANDING OF CASSINI INCA AND MAGNETOMETER DATA FROM NUMEROUS TITAN FLYBYS. THE SYNTHETIC ENA FLUX MAPS GENERATED DURING THIS EFFORT WILL PROVIDE THE BASIS FOR A SYSTEMATIC DECOMPOSITION OF THE VARIOUS EFFECTS (DIFFERENT MAGNETOSPHERIC UPSTREAM REGIMES ASYMMETRIES DUE TO LARGE PICKUP ION GYRORADII) THAT CONTRIBUTE TO THE IMAGES TAKEN BY THE INCA CAMERA. THE COMPARISONS BETWEEN HYBRID MODELLING RESULTS AND CASSINI MAGNETOMETER DATA WILL PERMIT AN INDEPENDENT CHARACTERIZATION OF THE ASYMMETRIES INVOLVED IN TITAN'S PLASMA INTERACTION AT A LOCAL SCALE. THUS THE PROPOSED INVESTIGATION WILL MAKE SIGNIFICANT USE OF/GREATLY ENHANCE THE INTERPRETATION OF DATA RETURNED BY CASSINI'S INSTRUMENTS AS REQUIRED IN SECTION 1.1 PAGE C.10-1 OF THE ANNOUNCEMENT TEXT FOR THE CASSINI DATA ANALYSIS (CDAP) PROGRAM. IN ADDITION THE PROPOSED MODEL OF THE ENA EMISSION MORPHOLOGY WILL SIGNIFICANTLY "FACILITATE THE INTERPRETATION OF DATA FROM THE MISSION" AS REQUIRED IN SECTION 1.1 OF THE ANNOUNCEMENT FOR CDAP (CF. PAGE C.10-1). THUS THIS WORK HAS SIGNIFICANT RELEVANCE TO THE CASSINI DATA ANALYSIS PROGRAM AND IS THEREFORE RELEVANT TO NASA.