| Project/Area Number |
14340143
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Space and upper atmospheric physics
|
|---|
| Research Institution | TOHOKU UNIVERSITY |
|---|
Principal Investigator |
OKANO Shoichi Tohoku University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (10004483)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SAKANOI Takeshi Tohoku University, Graduate School of Science, Assistant Professor, 大学院・理学研究科, 助手 (80271857)
MORIOKA Akira Tohoku University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (50004479)
ONO Takayuki Tohoku University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (10141996)
|
|---|
| Project Period (FY) |
2002 – 2005
|
| Project Status |
Completed (Fiscal Year 2005)
|
| Budget Amount *help |
¥14,100,000 (Direct Cost: ¥14,100,000)
Fiscal Year 2005: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2004: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2003: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2002: ¥9,100,000 (Direct Cost: ¥9,100,000)
|
|---|
| Keywords | Jupiter / aurora / spectroscopy / Io / plasma / torus / sodium / sulfur ion / ファブリーペロー / Hα |
|---|
| Research Abstract |
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.
|
