Navegar

Colección

Datos Estadísticas

Artículo

Simon, S.; Van Treeck, S.C.; Wennmacher, A.; Saur, J.; Neubauer, F.M.; Bertucci, C.L.; Dougherty, M.K. "Structure of Titan's induced magnetosphere under varying background magnetic field conditions: Survey of Cassini magnetometer data from flybys TA-T85" (2013) Journal of Geophysical Research: Space Physics. 118(4):1679-1699
Estamos trabajando para incorporar este artículo al repositorio
Consulte el artículo en la página del editor
Consulte la política de Acceso Abierto del editor

Abstract:

Cassini magnetic field observations between 2004 and 2012 suggest the ambient field conditions near Titan's orbit to differ significantly from the frequently applied pre-Cassini picture (background magnetic field homogeneous and perpendicular to Titan's orbital plane, stationary upstream conditions). In this study, we analyze the impact of these varying background field conditions on the structure of Titan's induced magnetosphere by conducting a systematic survey of Cassini magnetic field observations in the interaction region during flybys TA-T85 (July 2004-July 2012). We introduce a set of criteria that allow to identify deviations in the structure of Titan's induced magnetosphere - as seen by the Cassini magnetometer (MAG) - from the picture of steady-state field line draping. These disruptions are classified as "weak", "moderate", or "strong". After applying this classification scheme to all available Titan encounters, we survey the data for a possible correlation between the disruptions of the draping pattern and the ambient magnetospheric field conditions, as characterized by Simon et al. [2010a]. Our major findings are: (1) When Cassini is embedded in the northern or southern lobe of Saturn's magnetodisk within a ± 3 h interval around closest approach, Titan's induced magnetosphere shows little or no deviations at all from the steady-state draping picture. (2) Even when Titan is embedded in perturbed current sheet fields during an encounter, the notion of draping the average background field around the moon's ionosphere is still applicable to explain MAG observations from numerous Titan flybys. (3) Only when Titan is exposed to intense north-south oscillations of Saturn's current sheet at the time of an encounter, the signatures of the moon's induced magnetosphere may be completely obscured by the ambient field perturbations. (4) So far, T70 is the only flyby that fully meets the idealized pre-Cassini picture of the Titan interaction (steady background field perpendicular to Titan's orbital plane, steady upstream flow, unperturbed induced magnetosphere). Key Points Only weak influence of ambient perturbations on Titan's induced magnetosphereNew classification scheme for Cassini MAG data from flybys TA-T85Only T70 fully meets the idealized pre-Cassini picture of the Titan interaction ©2013. American Geophysical Union. All Rights Reserved.

Registro:

Documento: Artículo
Título:Structure of Titan's induced magnetosphere under varying background magnetic field conditions: Survey of Cassini magnetometer data from flybys TA-T85
Autor:Simon, S.; Van Treeck, S.C.; Wennmacher, A.; Saur, J.; Neubauer, F.M.; Bertucci, C.L.; Dougherty, M.K.
Filiación:Institute of Geophysics and Meteorology, University of Cologne, Germany
Institute for Astronomy and Space Physics, CONICET/University of Buenos Aires, Ciudad Universitaria, Buenos Aires, Argentina
Space and Atmospheric Physics Group, Blackett Laboratory, Imperial College London, United Kingdom
Palabras clave:Cassini magnetometer; induced magnetosphere; magnetodisk; moon-magnetosphere interaction; titan
Año:2013
Volumen:118
Número:4
Página de inicio:1679
Página de fin:1699
DOI: http://dx.doi.org/10.1002/jgra.50096
Título revista:Journal of Geophysical Research: Space Physics
Título revista abreviado:J. Geophys. Res. A. Space Phys.
ISSN:21699402
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699402_v118_n4_p1679_Simon

Referencias:

  • Achilleos, N., Arridge, C.S., Bertucci, C., Jackman, C.M., Dougherty, M.K., Khurana, K.K., Russell, C.T., Large-scale dynamics of Saturn's magnetopause: Observations by Cassini (2008) J. Geophys. Res., 113, pp. A11-A209. , doi: 10.1029/2008JA013265
  • Arridge, C.S., Russell, C.T., Khurana, K.K., Achilleos, N., Cowley, S.W.H., Dougherty, M.K., Southwood, D.J., Bunce, E.J., Saturn's magnetodisc current sheet (2008) J. Geophys. Res., 113, pp. A4-A214. , doi: 10.1029/2007JA012540
  • Arridge, C.S., Khurana, K.K., Russell, C.T., Southwood, D.J., Achilleos, N., Dougherty, M.K., Coates, A.J., Leinweber, H.K., Warping of Saturn's magnetospheric and magnetotail current sheets (2008) J. Geophys. Res., 113, pp. A8-A217. , doi: 10.1029/2007JA012963
  • Arridge, C.S., Periodic motion of Saturn's nightside plasma sheet (2011) J. Geophys. Res., 116, pp. A11-A205. , ., doi: 10.1029/2011JA016827
  • Arridge, C.S., Upstream of Saturn and Titan (2011) Space Science Rev., 162 (14), pp. 25-83. , ., doi: 10.1007/s11214-011-9849-x
  • Arridge, C.S., Achilleos, N., Guio, P., Electric field variability and classifications of Titan's magnetoplasma environment (2011) Ann. Geophys., 29 (7), pp. 1253-1258. , doi: 10.5194/angeo-29-1253-2011
  • Backes, H., (2005) Titan's Interaction with the Saturnian Magnetospheric Plasma, , Ph.D. thesis, Universität zu Köln
  • Backes, H., Titan's magnetic field signature during the first Cassini encounter (2005) Science, 308 (5724), pp. 992-995. , , doi: 10.1126/science.1109763
  • Bertucci, C., Neubauer, F.M., Szego, K., Wahlund, J.-E., Coates, A.J., Dougherty, M.K., Young, D.T., Kurth, W.S., Structure of Titan's mid-range magnetic tail: Cassini magnetometer observations during the T9 flyby (2007) Geophys. Res. Lett., 34 (24). , L24S02, doi: 10.1029/2007GL030865
  • Bertucci, C., The magnetic memory of Titan's ionized atmosphere (2008) Science, 321 (5895), pp. 1475-1478. , et la., doi: 10.1126/science.1159,780
  • Bertucci, C., Sinclair, B., Achilleos, N., Hunt, P., Dougherty, M.K., Arridge, C.S., The variability of Titan's magnetic environment (2009) Planet. Space Sci., 57 (1415), pp. 1813-1820. , doi: 10.1016/j.pss.2009.02.009
  • Coates, A.J., Crary, F.J., Young, D.T., Szego, K., Arridge, C.S., Bebesi, Z., Sittler, E.C., Hill, T.W., Ionospheric electrons in Titan's tail: Plasma structure during the Cassini T9 encounter (2007) Geophys. Res. Lett., 34, p. 24. , L24S05, doi: 10.1029/2007GL030919
  • Cravens, T.E., Dynamical and magnetic field time constants for Titan's ionosphere: Empirical estimates and comparisons with Venus (2010) J. Geophys. Res., 115, pp. A8-A319. , ., doi: 10.1029/2009JA015050
  • Dougherty, M.K., The Cassini magnetic field investigation (2004) Space Science Reviews, 114, pp. 331-383. , ., doi: 10.1007/s11214-004-1432-2
  • Kallio, E., Sillanpää, I., Janhunen, P., Titan in subsonic and supersonic flow (2004) Geophys. Res. Lett., 31 (15), pp. L15-L703. , doi: 10.1029/2004GL020344
  • Kallio, E., Sillanpää, I., Jarvinen, R., Janhunen, P., Dougherty, M., Bertucci, C., Neubauer, F., Morphology of the magnetic field near Titan: Hybrid model study of the Cassini T9 flyby (2007) Geophys. Res. Lett., 34 (24). , L24S09, doi: 10.1029/2007GL030827
  • Ledvina, S.A., Luhmann, J.G., Brecht, S.H., Cravens, T.E., Titan's induced magnetosphere (2004) Adv. Space Res., 33 (11), pp. 2092-2102. , doi: 10.1016/j.asr.2003.07.056
  • Luhmann, J.G., Titan's ion exosphere wake: A natural ion mass spectrometer? (1996) J. Geophys. Res., 101 (E12), p. 29. , doi: 10.1029/96JE03307
  • Ma, Y.-J., Nagy, A.F., Cravens, T.E., Sokolov, I.V., Hansen, K.C., Wahlund, J.-E., Crary, F.J., Dougherty, M.K., Comparisons between MHD model calculations and observations of Cassini flybys of Titan (2006) J. Geophys. Res., 111, pp. A5-A207. , doi: 10.1029/2005JA011481
  • Ma, Y.-J., D global multi-species Hall-MHD simulation of the Cassini T9 flyby (2007) Geophys. Res. Lett., 34. , ., 3, L24S10, doi: 10.1029/2007GL031627
  • Ma, Y.-J., Time-dependent global MHD simulations of Cassini T32 flyby: From magnetosphere to magnetosheath (2009) J. Geophys. Res., 114, pp. A3-A204. , ., doi: 10.1029/2008JA013676
  • Ma, Y.J., The importance of thermal electron heating in Titan's ionosphere: Comparison with Cassini T34 flyby (2011) J. Geophys. Res., 116, pp. A10-A213. , ., doi: 10.1029/2011JA016657
  • Müller, J., Simon, S., Motschmann, U., Glassmeier, K.H., Saur, J., Schuele, J., Pringle, G.J., Magnetic field fossilization and tail reconfiguration in Titan's plasma environment during a magnetopause passage: 3D adaptive hybrid code simulations (2010) Planet. Space Sci., 58 (12), pp. 1526-1546. , doi: 10.1016/j.pss.2010.07.018
  • Németh, Z., Szego, K., Bebesi, Z., Erdos, G., Foldy, L., Rymer, A., Sittler, E.C., Wellbrock, A., Ion distributions of different Kronian plasma regions (2011) J. Geophys. Res., 116, pp. A9-A212. , doi: 10.1029/2011JA016585
  • Neubauer, F.M., Gurnett, D.A., Scudder, J.D., Hartle, R.E., Titan's magnetospheric interaction (1984) Saturn, pp. 760-787. , in, edited by T. Gehrels and M. S. Matthews, University of Arizona Press, Tucson, Arizona
  • Neubauer, F.M., Titan's near magnetotail from magnetic field and plasma observations and modelling: Cassini flybys TA, TB and T3 (2006) J. Geophys. Res., 111, pp. A10-A220. , ., doi: 10.1029/2006JA011676
  • Neubauer, F.M., Hoerdt, A., Wennmacher, A., Simon, S., Bertucci, C., Dougherty, M.K., (2010) Fossil Magnetic Fields Due to Titan's Plasma Interaction Revisited: The Role of the Electric Conductivities in the Ionosphere and in Titan's Interior, American Geophysical Union, Fall Meeting 2010, Abstract #SM13D-07
  • Rymer, A.M., Smith, H.T., Wellbrock, A., Coates, A.J., Young, D.T., Discrete classification and electron energy spectra of Titan's varied magnetospheric environment (2009) Geophys. Res. Lett., 36, pp. L15-L109. , doi: 10.1029/2009GL039427
  • Sillanpää, I., Young, D.T., Crary, F., Thomsen, M., Reisenfeld, D., Wahlund, J.-E., Bertucci, C., Janhunen, P., Cassini Plasma Spectrometer and hybrid model study on Titan's interaction: Effect of oxygen ions (2011) J. Geophys. Res., 116, pp. A7-A223. , doi: 10.1029/2011JA016443
  • Simon, S., Motschmann, U., Titan's induced magnetosphere under non-ideal upstream conditions: 3D multi-species hybrid simulations (2009) Planet. Space Sci., 57 (1415), pp. 2001-2015. , doi: 10.1016/j.pss.2009.08.010
  • Simon, S., Boesswetter, A., Bagdonat, T., Motschmann, U., Glassmeier, K.-H., Plasma environment of Titan: A 3-d hybrid simulation study (2006) Ann. Geophys., 24 (3), pp. 1113-1135
  • Simon, S., Boesswetter, A., Bagdonat, T., Motschmann, U., Schuele, J., Three-dimensional multispecies hybrid simulation of Titan's highly variable plasma environment (2007) Ann. Geophys., 25 (1), pp. 117-144
  • Simon, S., Kleindienst, G., Boesswetter, A., Bagdonat, T., Motschmann, U., Glassmeier, K.-H., Schuele, J., Dougherty, M.K., Hybrid simulation of Titan's magnetic field signature during the Cassini T9 flyby (2007) Geophys. Res. Lett, 34. , (L24S08), doi: 10.1029/2007GL029967
  • Simon, S., Motschmann, U., Glassmeier, K.-H., Influence of non-stationary electromagnetic field conditions on ion pick-up at Titan: 3-d multispecies hybrid simulations (2008) Ann. Geophys., 26 (3), pp. 599-617
  • Simon, S., Motschmann, U., Kleindienst, G., Saur, J., Bertucci, C., Dougherty, M., Arridge, C., Coates, A., Titan's plasma environment during a magnetosheath excursion: Real-time scenarios for Cassini's T32 flyby from a hybrid simulation (2009) Ann. Geophys., 27 (2), pp. 669-685
  • Simon, S., Saur, J., Neubauer, F., Motschmann, U., Dougherty, M., Plasma wake of Tethys: Hybrid simulations versus Cassini MAG data (2009) Geophys. Res. Lett., 36 (4), pp. L4-L108. , doi: 10.1029/2008GL036943
  • Simon, S., Wennmacher, A., Neubauer, F., Bertucci, C., Kriegel, H., Saur, J., Russell, C., Dougherty, M., Titan's highly dynamic magnetic environment: A systematic survey of Cassini magnetometer observations from flybys TA-T62 (2010) Planet. Space Sci., 58 (10), pp. 1230-1251. , doi: 10.1016/j.pss.2010.04.021
  • Simon, S., Wennmacher, A., Neubauer, F., Bertucci, C., Kriegel, H., Saur, J., Russell, C., Dougherty, M., Dynamics of Saturn's magnetodisk near Titan's orbit: Comparison of Cassini magnetometer observations from real and virtual Titan flybys (2010) Planet. Space Sci., 58 (12), pp. 1625-1635. , doi: 10.1016/j.pss.2010.08.006
  • Simon, S., Motschmann, U., Kleindienst, G., Glassmeier, K.-H., Bertucci, C., Dougherty, M.K., Titan's magnetic field signature during the Cassini T34 flyby: Comparison between hybrid simulations and MAG data (2008) Geophys. Res. Lett., 35, pp. L04107. , doi: 10.1029/2007GL033056
  • Snowden, D., Winglee, R., Kidder, A., Titan at the edge Part I: Titan's interaction with Saturn's magnetosphere in the pre-noon sector (2011) J. Geophys. Res., 116, pp. A8-A229. , doi: 10.1029/2011JA016435
  • Snowden, D., Winglee, R., Kidder, A., Titan at the edge Part II: A global simulation of Titan exiting and re-entering Saturn's magnetosphere at 13.6 SLT (2011) J. Geophys. Res., 116, pp. A8-A230. , doi: 10.1029/2011JA016436
  • Szego, K., Bebesi, Z., Bertucci, C., Coates, A.J., Crary, F., Erdos, G., Hartle, R., Young, D.T., Charged particle environment of Titan during the T9 flyby (2007) Geophys. Res. Lett., 34 (24). , L24S03, doi: 10.1029/2007GL030677
  • Ulusen, D., Luhmann, J.G., Ma, Y.J., Mandt, K.E., Waite, J.H., Dougherty, M.K., Wahlund, J.E., Agren, K., Comparisons of Cassini flybys of the Titan magnetospheric interaction with an MHD model: Evidence for organized behavior at high altitudes (2012) Icarus, 217 (1), pp. 43-54. , doi: 10.1016/j.icarus.2011.10.009
  • Wei, H.Y., Russell, C.T., Wellbrock, A., Dougherty, M.K., Coates, A.J., Plasma environment at Titan's orbit with Titan present and absent (2009) Geophys. Res. Lett., 36 (23), pp. L23-L202. , doi: 10.1029/2009GL041048
  • Wei, H.Y., Russell, C.T., Dougherty, M.K., Neubauer, F.M., Ma, Y.J., Upper limits on Titan's magnetic moment and implications for its interior (2010) J. Geophys. Res., 115, pp. E10-E17. , doi: 10.1029/2009JE003,538
  • Winglee, R., Snowden, D., Kidder, A., Modification of Titan's ion tail and the Kronian magnetosphere: Coupled magnetospheric simulations (2009) J. Geophys. Res., 114, pp. A5-A215. , doi: 10.1029/2008JA013343

Citas:

---------- APA ----------
Simon, S., Van Treeck, S.C., Wennmacher, A., Saur, J., Neubauer, F.M., Bertucci, C.L. & Dougherty, M.K. (2013) . Structure of Titan's induced magnetosphere under varying background magnetic field conditions: Survey of Cassini magnetometer data from flybys TA-T85. Journal of Geophysical Research: Space Physics, 118(4), 1679-1699.
http://dx.doi.org/10.1002/jgra.50096
---------- CHICAGO ----------
Simon, S., Van Treeck, S.C., Wennmacher, A., Saur, J., Neubauer, F.M., Bertucci, C.L., et al. "Structure of Titan's induced magnetosphere under varying background magnetic field conditions: Survey of Cassini magnetometer data from flybys TA-T85" . Journal of Geophysical Research: Space Physics 118, no. 4 (2013) : 1679-1699.
http://dx.doi.org/10.1002/jgra.50096
---------- MLA ----------
Simon, S., Van Treeck, S.C., Wennmacher, A., Saur, J., Neubauer, F.M., Bertucci, C.L., et al. "Structure of Titan's induced magnetosphere under varying background magnetic field conditions: Survey of Cassini magnetometer data from flybys TA-T85" . Journal of Geophysical Research: Space Physics, vol. 118, no. 4, 2013, pp. 1679-1699.
http://dx.doi.org/10.1002/jgra.50096
---------- VANCOUVER ----------
Simon, S., Van Treeck, S.C., Wennmacher, A., Saur, J., Neubauer, F.M., Bertucci, C.L., et al. Structure of Titan's induced magnetosphere under varying background magnetic field conditions: Survey of Cassini magnetometer data from flybys TA-T85. J. Geophys. Res. A. Space Phys. 2013;118(4):1679-1699.
http://dx.doi.org/10.1002/jgra.50096