Physics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....8252k&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #8252
Physics
Scientific paper
The atmosphere of Titan is affected by a continuos flow of plasma. The nearby plasma acts both as an energy and particle source as well as a sink for the neutral atmosphere. One of the effects associated with the interaction between the flowing plasma and the atmosphere is a non-thermal escape of planetary ions to the plasma flow in which the convective electric field accelerates, "picks up", atmospheric and exospheric ions. A quasineutral hybrid simulation provides a self-consistent tool to study such ion escape process. In such a kinetic model the ions are treated as particles while electrons form a charge neutralizing massless fluid. The model can contain several ion species and it takes automatically into account finite gyroradius effects of the ions. The presented preliminary Titan model is a modified version of the quasineutral hybrid model which has earlier been used to study Martian atmospheric erosion (Kallio and Janhunen, JGR, 2001, 2002) and the Hermean magnetosphere (Kallio and Janhunen, Annales Geophysicae, submitted, 2002). The main goal of the modelling project is to provide a tool to analyse plasma and field measurements at the Saturnian system expected to be obtained by the Cassini/Huygens mission and, especially, help to interpret and/or provide background information for the measurements made by its IBS/CAPS/Cassini and PPI/Hasi/Huygens instruments. In addition, the model will include charge exchange processes between fast ions and cold atmospheric neutrals which produce Energetic Neutral Atoms (ENA) and soft X-rays expanding the capacity of the developed model to interpret ENA and X-ray imager instrument measurements as well. The paper gives a status report of the ongoing plasma-neutral atmosphere interaction global modelling project on Titan.
Harri Ari-Matti
Janhunen Pekka
Kallio Esa
Mäkinen Teemu
Mursula Kalevi
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