World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Periodic Modulation of Gas Giant Magnetospheres by the Neutral Upper Atmosphere : Volume 24, Issue 10 (20/10/2006)

By Smith, C. G. A.

Click here to view

Book Id: WPLBN0004001353
Format Type: PDF Article :
File Size: Pages 9
Reproduction Date: 2015

Title: Periodic Modulation of Gas Giant Magnetospheres by the Neutral Upper Atmosphere : Volume 24, Issue 10 (20/10/2006)  
Author: Smith, C. G. A.
Volume: Vol. 24, Issue 10
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2006
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

A. Smit, C. G. (2006). Periodic Modulation of Gas Giant Magnetospheres by the Neutral Upper Atmosphere : Volume 24, Issue 10 (20/10/2006). Retrieved from http://www.ebooklibrary.org/


Description
Description: Atmospheric Physics Laboratory, Department of Physics and Astronomy, University College, London, UK. Periodic signatures present in the magnetospheres of both Jupiter and Saturn have yet to be fully explained. At Jupiter the unexplained signatures are related to emissions from the Io torus (System IV); at Saturn they are observed in emissions of kilometric radiation (SKR) and in magnetometer data. These signatures are often interpreted in terms of magnetic field anomalies. This paper describes an alternative mechanism by which the neutral atmosphere may impose such periodic signatures on the magnetosphere. The mechanism invokes a persistent zonal asymmetry in the neutral wind field that rotates with the planet. This asymmetry must be coupled to substantial ionospheric conductivity. It is then able to drive divergent currents in the upper atmosphere that close in and perturb the magnetosphere. We estimate the conductivities and wind speeds required for these perturbations to be significant, and argue that they are most likely to be important at auroral latitudes where the conductivity may be enhanced by particle precipitation.

Summary
Periodic modulation of gas giant magnetospheres by the neutral upper atmosphere

Excerpt
Banks, P. M. and Kockarts, G.: Aeronomy, Academic Press, 1973.; Brown, M. E.: Periodicities in the Io plasma torus, \jgr, 100, 21 683–21 696, 1995.; Bunce, E. J., Cowley, S. W. H., and Wild, J. A.: Azimuthal magnetic fields in Saturn's magnetosphere: effects associated with plasma subcorotation and the magnetopause-tail current system, \ag, 21, 1709–1722, 2003.; Cecconi, B. and Zarka, P.: Model of a variable radio period for Saturn, \jgr, 110, 12 203, doi:10.1029/2005JA011085, 2005.; Chen, R. H.: Studies of Jupiter's lower ionospheric layers, \jgr, 86, 7792–7794, 1981.; Cowley, S. W. H., Wright, D. M., Bunce, E. J., Carter, A. C., Dougherty, M. K., Giampieri, G., Nichols, J. D., and Robinson, T. R.: Cassini observations of planetary-period magnetic field oscillations in Saturn's magnetosphere: Doppler shifts and phase motion, \grl, 33, doi:10.1029/2005GL025522, 2006.; Desch, M. D. and Kaiser, M. L.: Voyager measurement of the rotation period of Saturn's magnetic field, \grl, 8, 253–256, 1981.; Espinosa, S. A., Southwood, D. J., and Dougherty, M. K.: Reanalysis of Saturn's magnetospheric field data view of spin-periodic perturbations, \jgr, 108, doi:10.1029/2001JA005083, 2003a.; Espinosa, S. A., Southwood, D. J., and Dougherty, M. K.: How can Saturn impose its rotation period in a noncorotating magnetosphere?, \jgr, 108, doi:10.1029/2001JA005084, 2003b.; Galopeau, P. H. M. and Lecacheux, A.: Variations of Saturn's radio rotation period measured at kilometer wavelengths, \jgr, 105, 13 089–13 102, 2000.; Geiss, J. and Bürgi, A.: Diffusion and thermal diffusion in partially ionized gases in the atmospheres of the sun and planets, Astronomy & Astrophysics, 159, 1–2, 1986.; Giampieri, G. and Dougherty, M. K.: Rotation rate of Saturn's interior from magnetic field observations, \grl, 31, 16 701, doi:10.1029/2004GL020194, 2004.; Giampieri, G., Dougherty, M. K., Smith, E. J., and Russell, C. T.: A regular period for Saturn's magnetic field that may track its internal rotation, \nat, 441, doi:10.1038/nature04750, 2006.; Hill, T. W.: Inertial limit on corotation, \jgr, 84, 6554–6558, 1979.; Hill, T. W.: Corotation lag in Jupiter's magnetosphere – Comparison of observation and theory, Science, 207, 301–302, 1980.; Hinson, D. P., Twicken, J. D., and Karayel, E. T.: Jupiter's ionosphere: New results from Voyager 2 radio occultation measurements, \jgr, 103, 9505–9520, 1998.; Huang, T. S. and Hill, T. W.: Corotation lag of the Jovian atmosphere, ionosphere, and magnetosphere, \jgr, 94, 3761–3765, 1989.; Hubbard, W. B., Porco, C. C., Hunten, D. M., Rieke, G. H., Rieke, M. J., McCarthy, D. W., Haemmerle, V., Haller, J., McLeod, B., Lebofsky, L. A., Marcialis, R., Holberg, J. B., Landau, R., Carrasco, L., Elias, J., Buie, M. W., Dunham, E. W., Persson, S. E., Boroson, T., West, S., French, R. G., Harrington, J., Elliot, J. L., Forrest, W. J., Pipher, J. L., Stover, R. J., Brahic, A., and Grenier, I.: Structure of Saturn's Mesosphere from the 28 SGR Occultations, \icarus, 130, 404–425, 1997.; Ingersoll, A. P., Dowling, T. E., Gierasch, P. J., Orton, G. S., Read, P. L., Sánchez-Lavega, A., Showman, A. P., Simon-Miller, A. A., and Vasavada, A. R.: Dynamics of Jupiter's atmosphere, pp. 105–128, Jupiter. The Planet, Satellites and Magnetosphere, 2004.; Kim, Y. H. and Fox

 

Click To View

Additional Books


  • New Electron Energy Transfer Rates for V... (by )
  • Errors Due to Random Noise in Velocity M... (by )
  • Energetic Particle Observations at the S... (by )
  • Time-varying Magnetotail Magnetic Flux C... (by )
  • Gps Phase Scintillation at High Latitude... (by )
  • Simulation Study of the High-latitude F-... (by )
  • Parameterization of Ionization Rate by A... (by )
  • Principal Components' Features of Mid-la... (by )
  • The Auroral and Ionospheric Flow Signatu... (by )
  • Double Discontinuities at the Magnetotai... (by )
  • Seek-2 (Sporadic-E Experiment Over Kyush... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.