期刊
PLANETARY AND SPACE SCIENCE
卷 57, 期 14-15, 页码 1847-1856出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pss.2009.09.006
关键词
Titan; Ionosphere; Heavy ions; Ionospheric winds; Ion temperature
资金
- Cassini CAPS [1283095]
- INMS operations teams
- NASA/JPL [959930]
Multiple Titan encounters by the Cassini spacecraft have shown that ion chemistry in Titan's upper atmosphere is much more complex than previously thought. As well as showing a great variety of species present below 100 amu, they also include the detection of negative ions and of large abundances of ions above 100 amu. Here, we use data from two Cassini instruments, the Cassini plasma spectrometer's ion beam sensor (CAPS/IBS) and the ion and neutral mass spectrometer (INMS) during fourteen Cassini encounters with Titan's upper atmosphere. By simultaneous analysis of the combined data, we are able to determine the ion temperature, one component of the wind speed and spacecraft potential. Using these derived quantities, we are also able to extend the analysis of CAPS/IBS data to quantify the abundance of ions above 100 amu and to statistically estimate their composition. (C) 2009 Elsevier Ltd. All rights reserved.
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