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STUDY ON IONIZATION PROCESS OF VOLCANIC GAS ORIGINATED FROM JOVIAN SATELLITE IO BASSED ON OPTICAL OBSERVATION AT HALEAKALA

基于哈雷阿卡拉光学观测的木星IO卫星火山气体电离过程研究

基本信息

批准号：
14403007
负责人：
OKANO Shoichi
金额：
$ 5.31万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14403007/
关键词：
Jupiter Io Volcanic Gas Plasma torus Sulfur ion Sodioum Hawaii Haleakala

项目摘要

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.

本研究在每年2月和3月木星接近冲日时在哈雷卡尔高海拔天文台进行光学观测，并在2002财政年度利用28 cm施密特-卡塞格伦望远镜和装有干涉滤光片的冷却CCD相机对木卫一等离子体环中的硫离子发射进行了初步观测。在2003财政年度，使用新开发的波长分辨率为60，000的法布里-珀罗成像仪进行了观测，该成像仪与35厘米施密特-卡塞格伦望远镜相连。2004财政年度也继续观察到同样的情况。通过使用法布里-珀罗成像仪，可以进行多普勒分辨观测。这使我们能够获得硫离子发射强度、等离子体环中硫离子的体速度及其与木星磁场共转的偏差、平行于和垂直于磁场线的离子温度的二维分布。用视场为5.7 °的宽视场成象仪，对距木星400个木星半径的钠星云进行了观测每年度。除了这些观测外，在2004财政年度，还利用一台与配备有自适应光学系统的3.7米AEOS望远镜耦合的法布里-珀罗成像仪观测了靠近木卫一的钠发射分布。这一观察使我们能够获得钠原子在靠近Io处的不对称分布。