MY PROPOSAL GOAL IS CHARACTERIZING IO'S INFLUENCE ON JUPITER'S MAGNETOSPHERE. THIS MOON IS THE PRIMARY PARTICLE SOURCE IN JUPITER'S MAGNETOSPHERE WITH SOURCE PARTICLES IONIZED QUICKLY BY THE HIGH RADIATION ENVIRONMENT ON TIMESCALES OF DAYS TO HOURS. THUS UNDERSTANDING THE IMPACT OF THIS MOON IS ESSENTIAL FOR UNDERSTANDING JUPITER'S MAGNETOSPHERE. THIS GOAL ALSO IMPACTS OUR UNDERSTANDING OF THE HABITABILITY OF EUROPA. IN ORDER TO INTERPRET EUROPA OBSERVATIONS IMPACTS OF THE DOMINANT SOURCE IO MUST BE IDENTIFIED AND ACCOUNTED FOR. SUCH A TASK IS QUITE DIFFICULT CONSIDERING IO ORBITS<4 RJ CLOSER TO JUPITER AND CAN EASILY IMPACT THE ENVIRONMENT AROUND EUROPA. THIS TASK IS EVEN MORE CHALLENGING BECAUSE IO VOLCANIC SOURCE VARIABILITY IS NOT WELL UNDERSTOOD OR CONSTRAINED. MY OBJECTIVES INCLUDE IDENTIFYING TIME PERIODS REPRESENTING VARYING LEVELS OF IO SOURCE ACTIVELY. I WILL THEN CHARACTERIZE THE MAGNETOSPHERIC ENVIRONMENT AS A FUNCTION OF MAGNETIC L SHELL MAGNETIC LATITUDE AND TIME. THEN USING THESE RESULTS AS CONSTRAINTS I WILL REPRODUCE THE 3-D NEUTRAL DISTRIBUTION DURING ALL OF OBSERVED PERIODS. FROM THESE RESULTS I PROPOSE TO CHARACTERIZE THE MAGNETOSPHERIC ENVIRONMENT RELATIVE TO DIFFERENT SOURCE ACTIVITY PERIODS AS WELL AS THE TIME CONSTANTS FOR MAGNETOSPHERIC RESPONSE TO IO SOURCE ACTIVITY VARIATION. APPROACH AND METHODOLOGY: TO ACCOMPLISH THESE GOALS I WILL BUILD ON MY PREVIOUS DATA ANALYSIS AND MODELING RESEARCH. THE JAXA HISAKI MISSION IS CURRENTLY OBSERVING THE JOVIAN NEUTRAL AND PLASMA TORI IN THE UV SPECTRUM. AS A GUEST INVESTIGATOR ON THIS MISSION I HAVE CONDUCTED RESEARCH ON THE BOTH OF THESE FEATURES. SO FAR WE HAVE COLLECTED THREE DISTINCT SEASONS OF OBSERVATIONS (>4 MONTHS FOR EACH PERIOD). THE FIRST SEASON SHOWS ONLY LOW IO ACTIVITY. THE SECOND SEASON SHOWS INCREASE PEAK AND DECREASE IN IO ACTIVITY. THE THIRD SEASON APPEARS TO SHOW A LOWER SOURCE ACTIVITY PERIOD. WHILE THESE OBSERVATIONS ARE VERY IMPORTANT AND CRITICAL THEY ARE ONLY ABLE TO OBSERVE THE NEAR IO TORUS ENVIRONMENT. THUS I INTEND TO CORRELATE THESE (AND FUTURE) OBSERVATIONAL PERIODS WITH ALL AVAILABLE JUNO PLASMA (JADE) AND ENERGETIC PARTICLE (JEDI) OBSERVATIONS. THESE DATA WILL PROVIDE CRITICAL INSIGHT INTO THE ENVIRONMENT AT OTHER MAGNETOSPHERIC REGIONS NOT OBSERVABLE BY HISAKI THUS PROVIDING A MORE COMPLETE UNDERSTANDING OF THE CURRENT MAGNETOSPHERIC ENVIRONMENT. THESE OBSERVATIONS THEN PROVIDE CRITICAL CONSTRAINTS FOR MY 3-D MONTE CARLO MAGNETOSPHERIC MODEL. MY MODEL ACCOUNTS FOR ALL GRAVITATIONAL EFFECTS AS WELL AS PARTICLE INTERACTION PROCESSES INCLUDING ELECTRON IMPACT IONIZATION AND DISSOCIATION PHOTO-IONIZATION AND PHOTO-DISSOCIATION RECOMBINATION CHARGE EXCHANGE NEUTRAL-NEUTRAL COLLISIONS COLLISION WITH JUPITER/SATELLITES AS WELL ESCAPE FROM THE MAGNETOSPHERE. THIS MATURE MODEL HAS BEEN VALIDATED AND SUCCESSFULLY APPLIED FOR OVER 14 YEARS. ADDITIONALLY WE RECENTLY INCORPORATED PLASMA TRANSPORT CODE TO PRODUCE A NEUTRAL-PLASMA SELF-CONSISTENT MODEL. WE WILL EXECUTE THIS MODEL USING ALL AVAILABLE JUNO AND HISAKI OBSERVATIONS TO ANALYZE THE MAGNETOSPHERIC RESPONSE DURING VARIOUS OBSERVED IO ACTIVITY PHASES TO SHOW HOW IO SOURCE ACTIVITY IMPACTS JUPITER'S MAGNETOSPHERE AS ALL AS HOW QUICKLY THE MAGNETOSPHERE RESPONDS TO SOURCE INCREASES AND DECREASES. SCOPE AND APPROPRIATENESS THE JUNO PSP: THIS PROPOSED WORK IS WITHIN THE SCOPE OF THE NASA JUNO PARTICIPATING SCIENTIST PROGRAM BECAUSE COMBINING MY MODEL AND HISAKI OBSERVATIONS WITH JUNO OBSERVATIONS WILL EXPAND SCIENTIFIC RETURN AND BROADEN JUNO MISSION INVESTIGATIONS. IN PARTICULAR MY PROPOSED INVESTIGATION IS DIRECTLY RELATED TO THE SOLICITED TOPIC: "GLOBAL MAGNETOSPHERE: EXPLORE JUPITER'S THREE-DIMENSIONAL GLOBAL MAGNETOSPHERE AWAY FROM THE POLAR REGIONS". THE PROGRAM ELEMENT IS APPROPRIATE BECAUSE ACCESS TO JUNO DATA THAT IS NOT CURRENTLY PUBLICALLY AVAILABLE IS ESSENTIAL FOR PROVIDING NECESSARY MAGNETOSPHERIC CONSTRAINTS.