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Béghin, C.; Canu, P.; Karkoschka, E.; Sotin, C.; Bertucci, C.; Kurth, W.S.; Berthelier, J.J.; Grard, R.; Hamelin, M.; Schwingenschuh, K.; Simões, F. "New insights on Titan's plasma-driven Schumann resonance inferred from Huygens and Cassini data" (2009) Planetary and Space Science. 57(14-15):1872-1888
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Abstract:

After a preliminary analysis of the low-frequency data collected with the electric antenna of the Permittivity, Wave and Altimetry (PWA) experiment onboard the Huygens Probe that landed on Titan on 14 January, 2005, it was anticipated in a previous article [Béghin et al., 2007. A Schumann-like resonance on Titan driven by Saturn's magnetosphere possibly revealed by the Huygens Probe. Icarus, 191, 251-266] that the Extremely Low-Frequency (ELF) signal at around 36 Hz observed throughout the descent, might have been generated in the upper ionosphere of Titan, driven by a plasma instability mechanism associated with the co-rotating Kronian plasma flow. The involved process was proposed as the most likely source of a Schumann resonance in the moon's atmospheric cavity, the second eigenmode of which is actually found by models to occur at around 36 Hz. In this paper, we present a thorough analysis of this signal based upon the Huygens Probe attitude data deduced from the Descent Imager Spectral Radiometer (DISR), and relevant measurements obtained from the Radio Plasma Wave Science (RPWS) experiment and from the magnetometer (MAG) onboard Cassini orbiter during flybys of Titan. We have derived several coherent characteristics of the signal which confirm the validity of the mechanism initially proposed and provide new and significant insights about such a unique type of Schumann resonance in the solar system. Indeed, the 36 Hz signal contains all the characteristics of a polarized wave, with the measured electric field horizontal component modulated by the antenna rotation, and an altitude profile in agreement with a Longitudinal Section Electric (LSE) eigenmode of the atmospheric cavity. In contrast to Earth's conditions where the conventional Transverse Magnetic mode is considered, the LSE mode appears to be the only one complying with the observations and the unexpected peculiar conditions on Titan. These conditions are essentially the lack of any lightning activity that can be ascertained from Cassini observations, the presence of an ionized layer centered around 62 km altitude that was discovered by the PWA instrumentation, and the existence of a subsurface conducting boundary which is mandatory for trapping ELF waves. A simple theoretical model derived from our analysis places tentatively consequential constraints on the conductivity profile in the lower ionosphere. It is also consistent with the presence of a conductive water ocean below an icy crust some tens of kilometers thick. © 2009 Elsevier Ltd.

Registro:

Documento: Artículo
Título:New insights on Titan's plasma-driven Schumann resonance inferred from Huygens and Cassini data
Autor:Béghin, C.; Canu, P.; Karkoschka, E.; Sotin, C.; Bertucci, C.; Kurth, W.S.; Berthelier, J.J.; Grard, R.; Hamelin, M.; Schwingenschuh, K.; Simões, F.
Filiación:LPC2E-CNRS-Université d'Orléans, 3A, Av. Recherche Scientifique, 45071 Orléans Cedex 2, France
CETP-IPSL-Université de Versailles-Saint Quentin en Yvelines, 78140 Vélizy-Villacoublay, France
Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721-0092, United States
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, United States
Institute for Astronomy and Space Physics (IAFE)-CONICET, University of Buenos Aires, Buenos Aires, Argentina
Department of Astronomy, University of Iowa, Iowa City, IA 52242, United States
CETP-IPSL, 4 Avenue de Neptune, 94107 Saint Maur Des Fossés, France
RSSD, ESA, ESTEC, Keplerlaan 1, 2200 AG Noordwijk, Netherlands
Space Research Institute, Austrian Academy of Sciences (IWF), Schmiedlstrasse 6, 8082 Graz, Austria
Palabras clave:Satellites atmospheres; Saturn magnetosphere; Titan and Interiors; Altitude profiles; Cassini; Cassini orbiter; Conductive water; Eigen modes; Extremely low frequencies; Huygens; Huygens probe; Lightning activity; Longitudinal section; Low-frequency data; Lower ionosphere; Plasma instabilities; Polarized wave; Preliminary analysis; Saturn magnetosphere; Schumann resonances; Spectral radiometers; Theoretical models; Transverse magnetic modes; Antennas; Electric field measurement; Electric fields; Electric furnaces; Electric network analysis; Electromagnetic fields; Ionosphere; Ionospheric measurement; Magnetohydrodynamics; Magnetosphere; Oceanography; Plasma diagnostics; Plasma waves; Plasmas; Probes; Resonance; Rotation; Satellites; Solar system; Space probes; Plasma stability
Año:2009
Volumen:57
Número:14-15
Página de inicio:1872
Página de fin:1888
DOI: http://dx.doi.org/10.1016/j.pss.2009.04.006
Título revista:Planetary and Space Science
Título revista abreviado:Planet. Space Sci.
ISSN:00320633
CODEN:PLSSA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00320633_v57_n14-15_p1872_Beghin

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Citas:

---------- APA ----------
Béghin, C., Canu, P., Karkoschka, E., Sotin, C., Bertucci, C., Kurth, W.S., Berthelier, J.J.,..., Simões, F. (2009) . New insights on Titan's plasma-driven Schumann resonance inferred from Huygens and Cassini data. Planetary and Space Science, 57(14-15), 1872-1888.
http://dx.doi.org/10.1016/j.pss.2009.04.006
---------- CHICAGO ----------
Béghin, C., Canu, P., Karkoschka, E., Sotin, C., Bertucci, C., Kurth, W.S., et al. "New insights on Titan's plasma-driven Schumann resonance inferred from Huygens and Cassini data" . Planetary and Space Science 57, no. 14-15 (2009) : 1872-1888.
http://dx.doi.org/10.1016/j.pss.2009.04.006
---------- MLA ----------
Béghin, C., Canu, P., Karkoschka, E., Sotin, C., Bertucci, C., Kurth, W.S., et al. "New insights on Titan's plasma-driven Schumann resonance inferred from Huygens and Cassini data" . Planetary and Space Science, vol. 57, no. 14-15, 2009, pp. 1872-1888.
http://dx.doi.org/10.1016/j.pss.2009.04.006
---------- VANCOUVER ----------
Béghin, C., Canu, P., Karkoschka, E., Sotin, C., Bertucci, C., Kurth, W.S., et al. New insights on Titan's plasma-driven Schumann resonance inferred from Huygens and Cassini data. Planet. Space Sci. 2009;57(14-15):1872-1888.
http://dx.doi.org/10.1016/j.pss.2009.04.006