Ion winds in Saturn's southern auroral/polar region
Ion winds in Saturn's southern auroral/polar region
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土星南极光/极地区域的离子风
DOI：
10.1016/j.icarus.2003.09.006
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发表时间：
2004
期刊：
影响因子：
3.2
通讯作者：
R. Joseph
中科院分区：
文献类型：
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作者：
T. Stallard;S. Miller;L. Trafton;T. Geballe;R. Joseph
我们提出了视线（l.o.s）的电离层风速剖面在南极光/极地地区的土星。我们的速度是通过测量H3+ν2Q（1,0−）线在3.953微米处的多普勒频移得出的。这项研究的数据是在2003年2月6日（美国时间）的晚上，使用位于夏威夷莫纳克亚山的美国宇航局红外望远镜设施（IRTF）上的高分辨率光谱仪CSHELL获得的。最后导出的l.o.s.速度剖面与与行星次自转的高层大气扩展区域一致：惯性参考中的离子速度仅为完全行星自转时预期的速度的1/3。我们根据最近关于克罗尼亚磁层的建议讨论了这些结果，并提出，在这个区域，土星的离子风可能受到太阳风的控制。
We present profiles of the line-of-sight (l.o.s.) ionospheric wind velocities in the southern auroral/polar region of Saturn. Our velocities are derived from the measurement of Doppler shifting of the H3+ν2Q(1,0−) line at 3.953 microns. The data for this study were obtained using the facility high-resolution spectrometer CSHELL on the NASA Infrared Telescope Facility (IRTF) on Mauna Kea, Hawaii, during the night of February 6, 2003 (UT). The l.o.s. velocity profiles finally derived are consistent with an extended region of the upper atmosphere sub-corotating with the planet: the ion velocities in the inertial reference are only 1/3 of those expected for full planetary corotation. We discuss the results in the light of recent proposals for the kronian magnetosphere, and suggest that, in this region, Saturn's ion winds may be under solar wind control.