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The Electron Density of Saturn's Magnetosphere : Volume 27, Issue 7 (29/07/2009)

By Morooka, M. W.

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Book Id: WPLBN0003981113
Format Type: PDF Article :
File Size: Pages 21
Reproduction Date: 2015

Title: The Electron Density of Saturn's Magnetosphere : Volume 27, Issue 7 (29/07/2009)  
Author: Morooka, M. W.
Volume: Vol. 27, Issue 7
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2009
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Persoon, A. M., Lewis, G. R., Coates, A. J., André, M., Gurnett, D. A., Wahlund, J.,...Kurth, W. S. (2009). The Electron Density of Saturn's Magnetosphere : Volume 27, Issue 7 (29/07/2009). Retrieved from http://www.ebooklibrary.org/


Description
Description: Swedish Institute of Space Physics, Uppsala, Sweden. We have investigated statistically the electron density below 5 cm−3 in the magnetosphere of Saturn (7–80 RS, Saturn radii) using 44 orbits of the floating potential data from the RPWS Langmuir probe (LP) onboard Cassini. The density distribution shows a clear dependence on the distance from the Saturnian rotation axis (√X2+Y2) as well as on the distance from the equatorial plane (|Z|), indicating a disc-like structure. From the characteristics of the density distribution, we have identified three regions: the extension of the plasma disc, the magnetodisc region, and the lobe regions. The plasma disc region is at L<15, where L is the radial distance to the equatorial crossing of the dipole magnetic field line, and confined to |Z|<5 RS. The magnetodisc is located beyond L=15, and its density has a large variability. The variability has quasi-periodic characteristics with a periodicity corresponding to the planetary rotation. For Z>15 RS, the magnetospheric density distribution becomes constant in Z. However, the density still varies quasi-periodically with the planetary rotation also in this region. In fact, the quasi-periodic variation has been observed all over the magnetosphere beyond L=15. The region above Z=15 RS is identified as the lobe region. We also found that the magnetosphere can occasionally move latitudinally under the control of the density in the magnetosphere and the solar wind. From the empirical distributions of the electron densities obtained in this study, we have constructed an electron density model of the Saturnian nightside magnetosphere beyond 7 RS. The obtained model can well reproduce the observed density distribution, and can thus be useful for magnetospheric modelling studies.

Summary
The electron density of Saturn's magnetosphere

Excerpt
André, N., Persoon, A. M., Goldstein, J., Burch, J. L., Louarn, P., Lewis, G. R., Rymer, A. M., Coates, A. J., Kurth, W. S., Sittler, E. C., Thomsen, M. F., Crary, F. J., Dougherty, M. K., Gurnett, D. A., and Young, D. T.: Magnetic signatures of plasma-depleted flux tubes in the Saturnian inner magnetosphere, Geophys. Res. Lett., 34, L14108, doi:10.1029/2007GL030374, 2007.; André, N.,~Louarn, N P.,~Arridge, C S., Lamy, L., Hansen, K C., Lewis, G R., Jackman, C., Bunce, E. J., Burch, J. L., Coates, A. J., Cecconi, B., Cowley, S. W.,~Dougherty, M. K., Khurana, K. K.,~Russell, C. T.,~Sittler, E. C., and Zarka, P.: Effects~of~a~corotating interaction~region~ on~the~structure~and~dynamics~of~the~Saturnian magnetosphere, The symposium for Saturn After Cassini-Huygens, 2008.; Arridge, C. S., Russell, C. T., Khurana, K. K., Achilleos, N., André, N., Rymer, A. M., Dougherty, M. K., and Coates, A. J.: Mass of Saturn's magnetodisc: Cassini observations, Geophys. Res. Lett., 34, L09108, doi:10.1029/2006GL028921, 2007.; 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, J. Geophys. Res., 113, A04214, doi:10.1029/2007JA012540, 2008.; Arridge, C. S., Khurana, K. K., Russell, C. T., Southwood, D. J., Achilleos, N., Dougherty, M. K., Coates, A. J., and Leinweber, H. K.: Warping of Saturn's magnetospheric and magnetotail current sheets, J. Geophys. Res., 113, A08217, doi:10.1029/2007JA012963, 2008.; Burch, J. L., Goldstein, J., Lewis, W. S., Young, D. T., Coates, A. J., Dougherty, M. K., and Andre, N.: Tethys and Dione as sources of outward-flowing plasma in Saturn's magnetosphere, Nature, 447, 833–835, 2007.; Carbary, J. F., Mitchell, D. G., Krimigis, S. M., and Krupp, N.: Evidence for spiral pattern in Saturn's magnetosphere using the new SKR longitudes, Geophys. Res. Lett., 34, L13105, doi:10.1029/2007GL030167, 2007.; Carbary, J. F., Mitchell, D. G., Brandt, P., Paranicas, C., and Krimigis, S. M.: ENA periodicities at Saturn, Geophys. Res. Lett., 35, L07102, doi:10.1029/2008GL033230, 2008.; Clarke, K. E., Andre, N., Andrews, D. J., Coates, A. J., Cowley, S. W. H., Dougherty, M. K., Lewis, G. R., McAndrews, H. J., Nichols, J. D., Robinson, T. R., and Wright, D. M.: Cassini observations of planetary-period oscillations of Saturn's magnetopause, Geophys. Res. Lett., 33, L23104, doi:10.1029/2006GL027821, 2006.; Connerney, J. E. P., Acuna, M. H., and Ness, N. F.: Saturn's ring current and inner magnetosphere, Nature, 292, 724–726, 1981.; Cully, C. M., Ergun, R. E., and Eriksson, A. I.: Electrostatic structure around spacecraft in tenuous plasmas, J. Geophys. Res., 112, A09211, doi:10.1029/2007JA012269, 2007.; Desch, M. D. and Kaiser M. L.: Voyager measurements of the rotation period of Saturn's magnetic field, Geophys. Res. Lett., 8, 253–256 1981.; Khurana, K. K. and Schwarzl, H. K.: Global structure of Jupiter's magnetospheric current sheet, J. Geophys. Res., 110, A07227, doi:10.1029/2004JA010757, 2005.; Dougherty, M. K., Achilleos, N., Andre, N., Arridge, C. S., Balogh, A., Bertucci, C., Burton, M. E., Cowley, S. W. H., Erdos, G., Giampieri, G., Glassmeier, K. H., Khurana, K. K., Leisner, J., Neubauer, F. M., Russell, C. T., Smith, E. J., Southwood, D. J., and Tsurutani, B. T.: Cassini magnetometer observations during Saturn orbit insertion, Science, 307, 1266–1270, 2005.; Eriksson, A. I. and Wahlund, J. E.: Charging of the Freja satellite in the auroral zone, Ieee T. Plasma Sci., 34, 2038–2045, 2006.; Escoubet, C. P., Pedersen, A., Schmidt, R., and Lindqvist, P. A.: Density in the magnetosphere inferred from ISEE 1 spacecraft potential, J. Geophys. Res., 102, 17595–17609, 1997.; Espinosa, S. A., Southwood, D. J., and Dougherty, M. K.: How can Saturn impose its rotation period in a noncorotating magnetosphere?, J. Geophys. Res., 108(A2), 1086, doi:10.1029/2001JA005084, 2003.; Giampieri, G., Dougherty, M. K., Smith, E. J., and Rus

 

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