| Project/Area Number |
14403007
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Space and upper atmospheric physics
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| Research Institution | Tohoku University |
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Principal Investigator |
OKANO Shoichi Tohoku University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (10004483)
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| Co-Investigator(Kenkyū-buntansha) |
MORIOKA Akira Tohoku University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (50004479)
MISAWA Hiroaki Tohoku University, Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (90219618)
SAKANOI Takeshi Tohoku University, Graduate School of Science, Assistant Professor, 大学院・理学研究科, 助手 (80271857)
TSUCHIA Fuminori Tohoku University, Graduate School of Science, Assistant Professor, 大学院・理学研究科, 助手 (10302077)
SATOH Takehiko Kumamoto Univ., Dept Education, Associate Professor, 教育学部, 助教授 (10297632)
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| Project Period (FY) |
2002 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥8,300,000 (Direct Cost: ¥8,300,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2002: ¥4,000,000 (Direct Cost: ¥4,000,000)
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| Keywords | Jupiter / Io / Volcanic Gas / Plasma torus / Sulfur ion / Sodioum / Hawaii / Haleakala |
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| Research Abstract |
Optical observations in this research were carried out at Haleakal High Altitude Observatory annually in February and March every year when Jupiter was close to its opposition.
Observation of sulfur ion emission in the Io plasma torus was preliminary tried using a combination of 28cm Schmidt-Cassegrain telescope and a cooled CCD camera equipped with an interference filter in fiscal year of 2002. In fiscal year of 2003, observation was carried out using a newly developed Fabry-Perot imager with wavelength resolving power of 60,000, which was connected to a 35cm Schmidt-Cassegrain telescope. Same observation was continued also in fiscal year of 2004. By using a Fabry-Perot imager, it became possible to make Doppler resolved observation. This allowed us to obtain 2-dimensional distributions of intensity of sulfur ion emission, bulk velocity of sulfur ions in the plasma torus and its deviation from corotation of Jovian magnetic field, and ion temperatures both parallel and perpendicular to the magnetic field line.
As for sodium emission, observations of sodium nebula extending by 400 Jovian radii from Jupiter were carried out using a wide field imaging instrument with a field of view of 5.7 degree in each year. In addition to these observations, in fiscal year of 2004, observation of distribution of sodium emission in close proximity of lo was made using a Fabry-Perot imager coupled to a 3.7m AEOS telescope equipped with an adaptive optics system. This observation allowed us to obtain asymmetric distribution of sodium atoms close to Io.
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