(Proposal ID) S10B-078 (PI) Uno, Takeru (Proposal Title) Jovian H_3^+ and H2 auroras: Energy transfers between neutral and plasma (Abstract) We propose the first reliable measurement of the distributions of brightness, temperature, and line-of-sight velocity of Jovian plasma (H_3^+) and nuetral (H_2) components. This region emits the infrared aurora in 2-4 micron from H_3^+ and H_2. Through these lines, we can potentially get the information of energy injections (by ionospheric electric field and Joule heating) into and momentum transfers (by collisions) between plasmas and neutrals. In previous observation, the morphological differences between neutral and plasma aurora is found. It shall be explained by the energy input and transfer processes in the upper atmospheres, but it is still unknown. The wide spectral coverage, high spectral resolution, and the high sensitivity of SUBARU/IRCS enables us the simultaneous measurement of multiple H_3^+ and H_2 emission lines in Jovian auroras with enough spatial and spectral resolutions. From the results, we will first derive the relationships between the difference of spatial distributions in neutral and plasma auroras, with temperature and velocity field profiles. It will tell the heating and energy transfer processes in the Jovian magnetosphere - ionosphere - thermosphere coupling system.