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Magnetospheric Mapping of the Dayside Uv Auroral Oval at Saturn Using Simultaneous Hst Images, Cassini Imf Data, and a Global Magnetic Field Model : Volume 29, Issue 7 (08/07/2011)

By Belenkaya, E. S.

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Book Id: WPLBN0003987548
Format Type: PDF Article :
File Size: Pages 14
Reproduction Date: 2015

Title: Magnetospheric Mapping of the Dayside Uv Auroral Oval at Saturn Using Simultaneous Hst Images, Cassini Imf Data, and a Global Magnetic Field Model : Volume 29, Issue 7 (08/07/2011)  
Author: Belenkaya, E. S.
Volume: Vol. 29, Issue 7
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2011
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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H. Cowle, S. W., Blokhina, M. S., Nichols, J. D., Belenkaya, E. S., & Kalegaev, V. V. (2011). Magnetospheric Mapping of the Dayside Uv Auroral Oval at Saturn Using Simultaneous Hst Images, Cassini Imf Data, and a Global Magnetic Field Model : Volume 29, Issue 7 (08/07/2011). Retrieved from http://members.worldlibrary.net/


Description
Description: Institute of Nuclear Physics, Moscow State University, Vorob'evy Gory, 119992 Moscow, Russia. We determine the field-aligned mapping of Saturn's auroras into the magnetosphere by combining UV images of the southern dayside oval obtained by the Hubble Space Telescope (HST) with a global model of the magnetospheric magnetic field. The model is tailored to simulate prevailing conditions in the interplanetary medium, corresponding to high solar wind dynamic pressure and variable interplanetary magnetic field (IMF) strength and direction determined from suitably lagged field data observed just upstream of Saturn's dayside bow shock by the Cassini spacecraft. Two out of four images obtained in February 2008 when such simultaneous data are available are examined in detail, exemplifying conditions for northward and southward IMF. The model field structure in the outer magnetosphere and tail is found to be very different in these cases. Nevertheless, the dayside UV oval is found to have a consistent location relative to the field structure in each case. The poleward boundary of the oval is located close to the open-closed field boundary and thus maps to the vicinity of the magnetopause, consistent with previous results. The equatorward boundary of the oval then maps typically near the outer boundary of the equatorial ring current appropriate to the compressed conditions prevailing. Similar results are also found for related images from the January 2004 HST data set. These new results thus show that the mapped dayside UV oval typically spans the outer magnetosphere between the outer part of the ring current and the magnetopause. It does not encompass the region of primary corotation flow breakdown within the inner Enceladus torus.

Summary
Magnetospheric mapping of the dayside UV auroral oval at Saturn using simultaneous HST images, Cassini IMF data, and a global magnetic field model

Excerpt
Alexeev, I. I.: The magnetospheres of Mercury, Earth, and the giant planets Jupiter and Saturn, Moscow Univ. Phys. Bull., 65, 300–306, 2010.; Alexeev, I. I. and Belenkaya, E. S.: Electric field in an open model of the magnetosphere, Geomagn. Aeron., 23, 57–61, 1983.; Alexeev, I. I. and Belenkaya, E. S.: Modeling of the Jovian Magnetosphere, Ann. Geophys., 23, 809–826, doi:10.5194/angeo-23-809-2005, 2005.; Alexeev, I. I., Kalegaev, V. V., Belenkaya, E. S., Bobrovnikov, S. Y., Bunce, E. J., Cowley, S. W. H., and Nichols, J. D.: A global magnetic model of Saturn's magnetosphere, and a comparison with Cassini SOI data, Geophys. Res. Lett., 33, L08101, doi:10.1029/2006GL025896, 2006.; Andrews, D. J., Cowley, S. W. H., Dougherty, M. K., and Provan, G.: Magnetic field oscillations near the planetary period in Saturn's equatorial magnetosphere: Variation of amplitude and phase with radial distance and local time, J. Geophys. Res., 115, A04212, doi:10.1029/2009JA014729, 2010.; Arridge, C. S., Russell, C. T., Khurana, K. K., Achilleos, N., Cowley, S. W. H., Dougherty, M. K., Southwood, D. J., and Bunce, E. J.: Saturn's magnetodisc current sheet, J. Geophys. Res., 113, A04214, doi:10.1029/2007JA012540, 2008.; Badman, S. V., Cowley, S. W. H., Gérard, J.-C., and Grodent, D.: A statistical analysis of the location and width of Saturn's southern auroras, Ann. Geophys., 24, 3533–3545, doi:10.5194/angeo-24-3533-2006, 2006.; Belenkaya, E. S., Alexeev, I. I., Kalegaev, V. V., and Blokhina, M. S.: Definition of Saturn's magnetospheric model parameters for the Pioneer 11 flyby, Ann. Geophys., 24, 1145–1156, doi:10.5194/angeo-24-1145-2006, 2006a.; Belenkaya, E. S., Cowley, S. W. H., and Alexeev, I. I.: Saturn's aurora in the January 2004 events, Ann. Geophys., 24, 1649–1663, doi:10.5194/angeo-24-1649-2006, 2006b.; Belenkaya, E. S., Alexeev, I. I., Blokhina, M. S., Cowley, S. W. H., Badman, S. V., Kalegaev, V. V., and Grigoryan, M. S.: IMF dependence of the open-closed field line boundary in Saturn's ionosphere, and its relation to the UV auroral oval observed by the Hubble Space Telescope, Ann. Geophys., 25, 1215–1226, doi:10.5194/angeo-25-1215-2007, 2007.; Belenkaya, E. S., Cowley, S. W. H., Badman, S. V., Blokhina, M. S., and Kalegaev, V. V.: Dependence of the open-closed field line boundary in Saturn's ionosphere on both the IMF and solar wind dynamic pressure: comparison with the UV auroral oval observed by the HST, Ann. Geophys., 26, 159–166, doi:10.5194/angeo-26-159-2008, 2008.; Belenkaya, E. S., Alexeev, I. I., Blokhina, M. S., Bunce, E. J., Cowley, S. W. H., Nichols, J. D., Kalegaev, V. V., Petrov, V. G., and Provan, G.: IMF dependence of Saturn's auroras: modelling study of HST and Cassini data from 12–15 February 2008, Ann. Geophys., 28, 1559–1570, doi:10.5194/angeo-28-1559-2010, 2010.; Blomberg, L. G., Cumnock, J. A., Alexeev, I. I., Belenkaya, E. S., Bobrovnikov

 

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