GROUND-BASED OBSERVATION OF VISIBLE AURORA ON JUPITER BY SPECTROSCOPIC IMAGING WITH NARROW BANDPASS

1.通过对冈山天文物理观测站利用高色散EEDES光谱仪和188厘米望远镜观测木星可见光极光的结果进行详细分析，发现在木星南极地区存在微弱的（S/N = 1）Hα极光。通过对2004年和2005年在哈雷阿卡拉山利用Fabry-Perot干涉仪观测结果的详细分析，得到了硫离子发射强度、硫离子体速度及其与等离子体环面共转速度的偏差以及垂直于和平行于磁力线的离子温度的二维分布。从这些结果可以清楚地看出，在远离木卫一的地区，等离子体对木卫一环的供应是相当均匀的，而且每年的供应量都是变化的。此外，我们还利用耦合到3.7米AEOS望远镜上的法布里-珀罗干涉仪观测了钠原子在木卫一附近的共振散射。详细的数据分析表明，钠原子的分布相对于木卫一的木星一侧和反木星一侧是不对称的.通过对离子源钠原子共振散射的观测和计算机模拟，发现溅射和分子离子的解离及解离复合是产生高速钠原子的主要过程。

1. Detailed examination of observation results on Jupiter visible aurora obtained at Okayama Astrophysical Observatory with High Dispersion Echell Spectrograph (HIDES) coupled with a 188-cm telescope revealed marginal (S/N〜1) detection of Hα aurora in the southern polar region of Jupiter.2. Based on detailed analysis of observation results obtained at Mt.Haleakala using a Fabry-Perot interferometer in 2004 and 2005, two-dimensional distributions of sulfur ion emission intensity, bulk velocities of sulfur ions and their deviation from the corotation velocity in Io plasma torus were obtained as well as ion temperatures perpendicular and parallel to the magnetic field line. From these results, it became clear that plasma supply to the Io torus is considerably uniform in a region away from Io, and that its amount is variable from year to year. In addition, resonant scattering of sodium atoms in the close proximity to Io was observed by using the Fabry-Perot interferometer coupled to a 3.7m AEOS telescope. Detailed analysis of the data showed that distribution of sodium atoms are asymmetric with respect to Io's Jupiter side and anti-Jupiter side.3. Based on observation of resonant scattering of Iogenic sodium atoms and computer simulation, sputtering and dissociation and dissociative recombination of molecular ion are found to be the dominant processes for producing high-velocity sodium atoms.