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Sittler, E.C.; Hartle, R.E.; Bertucci, C.; Coates, A.; Cravens, T.; Dandouras, I.; Shemansky, D. "Energy deposition processes in titan's upper atmosphere and its induced magnetosphere" (2010) Titan from Cassini-Huygens:393-453
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Abstract:

Most of Titan's atmospheric organic and nitrogen chemistry, aerosol formation, and atmospheric loss are driven from external energy sources such as Solar UV, Saturn's magnetosphere, solar wind and galactic cosmic rays. The Solar UV tends to dominate the energy input at lower altitudes∼1,200 km but which can extend down to ∼400 km, while the plasma interaction from Saturn's magnetosphere, Saturn's magnetosheath or solar wind are more important at higher altitudes ∼1,400 km, but the heavy ion plasma (O+) ∼5 keV and energetic ions (H+) ∼ 30 keV or higher from Saturn's magnetosphere can penetrate below 950 km. Cosmic rays with energies >1 GeV can penetrate much deeper into Titan's atmosphere with most of its energy deposited ∼70 km altitude. Haze layers are observed in scattered solar photons starting at 510 km, but aerosols are broadly distributed and measured in extinction from 1,000 km downward, diffusively separated to 400 km. The induced magnetic field from Titan's interaction with the external plasma can be very complex and will tend to channel the flow of energy into Titan's upper atmosphere. Cassini observations combined with advanced hybrid simulations of the plasma interaction with Titan's upper atmosphere show significant changes in the character of the interaction with Saturn local time at Titan's orbit where the magnetosphere displays large and systematic changes with local time. The external solar wind can also drive sub-storms within the magnetosphere which can then modify the magnetospheric interaction with Titan. Another important parameter is solar zenith angle (SZA) with respect to the co-rotation direction of the magnetospheric flow which is referred to as the solar incidence-ram angle. Titan's interaction can contribute to atmospheric loss via pickup ion loss, scavenging of Titan's ionospheric plasma, loss of ionospheric plasma down its induced magnetotail via an ionospheric wind, and non-thermal loss of the atmosphere via heating and sputtering induced by the bombardment of magnetospheric keV ions and electrons. This energy input evidently drives the large positive and negative ions observed below ∼1,100 km altitude with ion masses exceeding 10,000 Da. We refer to these ions as seed particles for the aerosols observed below 1,000 km altitude. These seed particles can be formed, for example, from the polymerization of acetylene (C2H2) and benzene (C6H6) molecules in Titan's upper atmosphere to form polycyclic aromatic hydrocarbons (PAH) and/or fullerenes (C 60). In the case of fullerenes, which are hollow spherical carbon shells, magnetospheric keV O+ ions can become trapped inside the fullerenes and eventually find themselves inside the aerosols as free oxygen. The aerosols are then expected to fall to Titan's surface as polymerized hydrocarbons with trapped free oxygen where unknown surface chemistry can take place. © 2010 Springer Science+Business Media B.V.

Registro:

Documento: Parte de libro
Título:Energy deposition processes in titan's upper atmosphere and its induced magnetosphere
Autor:Sittler, E.C.; Hartle, R.E.; Bertucci, C.; Coates, A.; Cravens, T.; Dandouras, I.; Shemansky, D.
Filiación:NASA/Goddard Space Flight Center, Greenbelt, MD, United States
Institute for Astronomy and Space Physics - IAFE, Ciudad Universitaria Buenos Aires, Argentina
Mullard Space Science Laboratory, University College London, United Kingdom
University of Kansas, Kansas, United States
Centre National de la Recherche Scientifique (CNRS), Centre d'Etude Spatiale des Rayonnements (CESR) Laboratory, Toulouse, France
University of Southern California, Department of Aerospace and Mechanical Engineering, Los Angeles, CA, United States
Año:2010
Página de inicio:393
Página de fin:453
DOI: http://dx.doi.org/10.1007/978-1-4020-9215-2_16
Título revista:Titan from Cassini-Huygens
Título revista abreviado:Titan from Cassini-Huygens
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97814020_v_n_p393_Sittler

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Citas:

---------- APA ----------
Sittler, E.C., Hartle, R.E., Bertucci, C., Coates, A., Cravens, T., Dandouras, I. & Shemansky, D. (2010) . Energy deposition processes in titan's upper atmosphere and its induced magnetosphere. Titan from Cassini-Huygens, 393-453.
http://dx.doi.org/10.1007/978-1-4020-9215-2_16
---------- CHICAGO ----------
Sittler, E.C., Hartle, R.E., Bertucci, C., Coates, A., Cravens, T., Dandouras, I., et al. "Energy deposition processes in titan's upper atmosphere and its induced magnetosphere" . Titan from Cassini-Huygens (2010) : 393-453.
http://dx.doi.org/10.1007/978-1-4020-9215-2_16
---------- MLA ----------
Sittler, E.C., Hartle, R.E., Bertucci, C., Coates, A., Cravens, T., Dandouras, I., et al. "Energy deposition processes in titan's upper atmosphere and its induced magnetosphere" . Titan from Cassini-Huygens, 2010, pp. 393-453.
http://dx.doi.org/10.1007/978-1-4020-9215-2_16
---------- VANCOUVER ----------
Sittler, E.C., Hartle, R.E., Bertucci, C., Coates, A., Cravens, T., Dandouras, I., et al. Energy deposition processes in titan's upper atmosphere and its induced magnetosphere. Titan from Cassini-Huygens. 2010:393-453.
http://dx.doi.org/10.1007/978-1-4020-9215-2_16