[en] Saturn auroral hiss is intense whistler mode emission similar in morphology to terrestrial
auroral hiss, and is observed at high latitude very often in quasiperiodic episodes with a period of
approximately 1 hr. Bader et al. (2019) report auroral pulsations that may be due to duskside magnetodisk reconnection. The source of the 1‐hr period is not definitively known but has been purported to be due to second harmonic Alfven waves standing along near planet magnetic field lines (Yates et al., 2016).
Observations of auroral hiss at high latitude along Cassini proximal orbits are often excellent, and we have
focused on an event for which we have concurrent ultraviolet auroral images as well as electron flux data. A series of repeating auroral hiss episodes is observed to initiate near the magnetic field line that traverses a Saturn kilometric radiation source region in each hemisphere, with periodic episodes of hiss recurring at higher L‐shells. Magnetic field lines centered on individual hiss episodes have auroral footprints that lie near and within a region of intense auroral ultraviolet emissions. These observations have a parallel in terrestrial
return current electron beam‐generated auroral hiss seen near magnetic field lines supporting auroral kilometric radiation source regions. Recent findings link periodic plasma injections with Saturn reconnection sites observed preferentially on the duskside. These injections may spawn Saturn kilometric radiation source regions and periodic auroral hiss emission in nearby return current regions.
Research Center/Unit :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Menietti, John Douglas; Department of Physics and Astronomy, University of Iowa, Iowa City, IA, USA
Palmaerts, Benjamin ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Zahlava, J.; 3 Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
Averkamp, T. F.; Department of Physics and Astronomy, University of Iowa, Iowa City, IA, USA
Groene, J. B.; Department of Physics and Astronomy, University of Iowa, Iowa City, IA, USA
Kurth, W. S.; Department of Physics and Astronomy, University of Iowa, Iowa City, IA, US
Language :
English
Title :
Quasiperiodic Saturn Auroral Hiss Observed During a Cassini Proximal Orbit
Bader, A., Badman, S. V., Yao, Z. H., Kinrade, J., & Pryor, W. R. (2019). Observations of continuous quasiperiodic auroral pulsations on Saturn in high time-resolution UV auroral imagery. Journal of Geophysical Research: Space Physics, 124. https://doi.org/10.1029/2018JA026320
Bradley, T. J., Cowley, S. W. H., Provan, C., Hunt, G. J., Bunce, E. J., Wharton, S. J., Alexeev, I. I., Belenkaya, E. S., Kalegaev, V. V., & Dougherty, M. K. (2018). Field-aligned currents in Saturn's nightside magnetosphere: Subcorotation and planetary period oscillation components during northern spring. Journal of Geophysical Research: Space Physics, 123. https://doi.org/10.1029/2017JA024885
Brice, N. M., & Ioannidis, G. A. (1970). The magnetospheres of Jupiter and Earth. Icarus, 13, 173–183. https://doi.org/10.1016/0019-1035(70)90048-5
Bunce, E. J., Cowley, S. W. H., Alexeev, I. I., Arridge, C. S., Dougherty, M. K., Nichols, J. D., & Russell, C. T. (2007). Cassini observations of the variation of Saturn's ring current parameters with system size. Journal of Geophysical Research, 112, A10202. https://doi.org/10.1029/2007JA012275
Carbary, J. F., Kurth, W. S., & Mitchell, D. G. (2016). Short periodicities in low-frequency plasma waves at Saturn. J. Geophys. Res. Space Physics, 121, 6562–6572. https://doi.org/10.1002/2016JA022732
Carlson, C. W., McFadden, J. P., Ergun, R. E., Temerin, M., Peria, W., Mozer, F. S., Klumpar, D. M., Shelley, E. G., Peterson, W. K., Moebius, E., Elphic, R., Strangeway, R., Cattell, C., & Pfaff, R. (1998). FAST observations in the downward auroral current regions: Energetic upgoing electron beams, parallel potential drops, and ion heating. Geophysical Research Letters, 25(12), 2017–2020. https://doi.org/10.1029/98GL00851
Cowley, S. W. H., & Bunce, E. J. (2003). Corotation-driven magnetosphere-ionosphere coupling currents in Saturn's magnetosphere and their relation to the auroras. Annales Geophysicae, 21(2109), 1691–1707.
Delamere, P. A., Otto, A., Ma, X., Bagenal, F., & Wilson, R. J. (2015). Magnetic flux circulation in the rotationally driven giant magnetospheres. Journal of Geophysical: Research, Space Physics, 120, 4229–4245. https://doi.org/10.1002/2015JA021036
Dougherty, M. K., Cao, H., Khurana, K. K., Hunt, G. J., Provan, G., Kellock, S., Burton, M. E., Burk, T. A., Bunce, E. J., Cowley, S. W. H., Kivelson, M. G., Russell, C. T., & Southwood, D. J. (2018). Saturn's magnetic field revealed by the Cassini Grand Finale. Science, 362, eaat5434. https://doi.org/10.1126/science.aat5434
Ergun, R. E., Carlson, C. W., McFadden, J. P., Mozer, F. S., Delory, G. T., Peria, W., Chaston, C. C., Temerin, M., Elphic, R., Strangeway, R., Pfaff, R., Cattell, C. A., Klumpar, D., Shelley, E., Peterson, W., Moebius, E., & Kistler, L. (1998). FAST satellite observations of electric field structures in the auroral zone. Geophysical Research Letters, 25(12), 2025–2028. https://doi.org/10.1029/98GL00635
Esposito, L. W., Barth, C. A., Colwell, J. E., Lawrence, G. M., McClintock, W. E., Stewart, A. I. F., Keller, H. U., Korth, A., Lauche, H., Festou, M. C., Lane, A. L., Hansen, C. J., Maki, J. N., West, R. A., Jahn, H., Reulke, R., Warlich, K., Shemansky, D. E., & Yung, Y. L. (2004). The Cassini ultraviolet imaging spectrograph investigation. Space Science Reviews, 115(1-4), 299–361. https://doi.org/10.1007/s11214-004-1455-8
Grodent, D., Gustin, J., Gerard, J.-C., Radioti, A., Bonfond, B., & Pryor, W. R. (2011). Small-scale structures in Saturn's ultraviolet aurora. Journal of Geophysical Research, 116, A09225. https://doi.org/10.1029/2011JA016818
Gurnett, D. A., & Bhattacharjee, A. (2005). Introduction to Plasma Physics. Cambridge, UK: Cambridge University Press.
Gurnett, D. A., Kurth, W. S., Kirchner, D. L., Hospodarsky, G. B., Averkamp, T. F., Zarka, P., Lecacheux, A., Manning, R., Roux, A., Canu, P., Cornilleau-Wehrlin, N., Galopeau, P., Meyer, A., Boström, R., Gustafsson, G., Wahlund, J. E., Åhlen, L., Rucker, H. O., Ladreiter, H. P., Macher, W., Woolliscroft, L. J. C., Alleyne, H., Kaiser, M. L., Desch, M. D., Farrell, W. M., Harvey, C. C., Louarn, P., Kellogg, P. J., Goetz, K., & Pedersen, A. (2004). The Cassini radio and plasma wave investigation. Space Science Reviews, 114(1-4), 395–463. https://doi.org/10.1007/s11214-004-1434-0
Gurnett, D. A., Persoon, A. M., Kopf, A. J., Kurth, W. S., Morooka, M. W., Wahlund, J.-E., Khurana, K. K., Dougherty, M. K., Mitchell, D. G., Krimigis, S. M., & Krupp, N. (2010). A plasmapause-like density boundary at high latitudes in Saturn's magnetosphere. Geophysical Research Letters, 37, L16806. https://doi.org/10.1029/2010GL044466
Gurnett, D. A., Shawhan, S. D., & Shaw, R. R. (1983). Auroral hiss, Z mode radiation, and auroral kilometric radiation in the polar magnetosphere: DE 1 observations. Journal of Geophysical Research, 88(A1), 329–340.
Hunt, G. J., Cowley, S. W. H., Provan, G., Bunce, E. J., Alexeev, I. I., Belenkaya, E. S., Kalegaev, V. V., Dougherty, M. K., & Coates, A. J. (2014). Field-aligned currents in Saturn's southern nightside magnetosphere: Sub-corotation and planetary period oscillation components. J. Geophys. Res. Space Physics, 119(12), 9847–9899. https://doi.org/10.1002/2014JA020506
Hunt, G. J., Cowley, S. W. H., Provan, G., Bunce, E. J., Alexeev, I. I., Belenkaya, E. S., Kalegaev, V. V., Dougherty, M. K., & Coates, A. J. (2015). Field-aligned currents in Saturn's northern nightside magnetosphere: Evidence for inter-hemispheric current flow associated with planetary period oscillations. Journal of Geophysical Research: Space Physics, 120, 7552–7584. https://doi.org/10.1002/2015JA021454
Hunt, G. J., Provan, G., Bunce, E. J., Cowley, S. W. H., Dougherty, M. K., & Southwood, D. J. (2018). Field-aligned currents in Saturn's magnetosphere: Observations from the F-ring orbits. Journal of Geophysical Research: Space Physics, 123, 3806–3821. https://doi.org/10.1002/2017JA025067
Kopf, A., Gurnett, D. A., Menietti, J. D., Schippers, P., Arridge, C. S., Hospodarsky, G. B., Kurth, W. S., Grimald, S., Andre, N., Coates, A. J., & Dougherty, M. K. (2010). Electron beams as the source of whistler-mode auroral hiss at Saturn. Geophysical Research Letters, 37, L09102. https://doi.org/10.1029/2010GL042980
Krimigis, S. M., Mitchell, D. G., Hamilton, D. C., Livi, S., Dandouras, J., Jaskulek, S., & Williams, D. J. (2004). Magnetosphere Imaging Instrument (MIMI) on the Cassini mission to Saturn/Titan. Space Science Reviews, 114(1-4), 233–329. https://doi.org/10.1007/978-1-4020-2774-1_3
Krupp, N., Roussos, E., Lagg, A., Woch, J., Muller, A. L., Krimigis, S. M., Mitchell, D. G., Roelof, E. C., Paranicas, C., Carbary, J., & Jones, G. H. (2009). Energetic particles in Saturn's magnetosphere during the Cassini nominal mission (July 2004-July 2008). Planetary and Space Science, 57(14-15), 1754–1768. https://doi.org/10.1016/j.pss.2009.06.010
Lamy, L., Zarka, P., Cecconi, B., Prangé, R., Kurth, W. S., & Gurnett, D. A. (2008). Saturn kilometric radiation: Average and statistical properties. Journal of Geophysical Research, 113, A07201. https://doi.org/10.1029/2007JA012900
Maggs, J. E. (1976). Coherent generation of VLF hiss. Journal of Geophysical Research, 80(10), 1707–1724. https://doi.org/10.1029/JA081i010p01707
Menietti, J. D., Averkamp, T. F., & Kurth, W. S. (2019). Survey of Saturn whistler mode hiss intensity. Journal of Geophysical: Research, 124, 4266–4277. https://doi.org/10.1029/2019JA026656
Menietti, J. D., Mutel, R. L., Schippers, P., Ye, S.-Y., Gurnett, D. A., & Lamy, L. (2011). Analysis of Saturn kilometric radiation near a source center. Journal of Geophysical Research, 116, A12222. https://doi.org/10.1029/2011JA017056
Mitchell, D. G., Carbary, J. F., Bunce, E. J., Radioti, A., Badman, S. V., Pryor, W. R., Hospodarsky, G. B., & Kurth, W. S. (2016). Recurrent pulsations in Saturn's high latitude magnetosphere. Icarus, 263, 94–100. https://doi.org/10.1016/j.icarus.2014.10.028
Mitchell, D. G., Kurth, W. S., Hospodarsky, G. B., Krupp, N., Saur, J., Mauk, B. H., Carbary, J. F, Krimigis, S. M., Dougherty, M. K., & Hamilton, D. C. (2009). Ion conics and electron beams associated with auroral processes on Saturn. Journal of Geophysical Research, 114, A02212. https://doi.org/10.1029/2008JA013621
Mutel, R. L., Menietti, J. D., Gurnett, D. A., Kurth, W., Schippers, P., Lynch, C., Lamy, L., Arridge, C., & Cecconi, B. (2010). CMI growth rates for Saturnian kilometric radiation. Geophysical Research Letters, 37, L19105. https://doi.org/10.1029/2010GL044940
Palmaerts, B., Roussos, E., Krupp, N., Kurth, W. S., Mitchell, D. G., & Yates, J. N. (2016). Statistical analysis and multi-instrument overview of the quasi-periodic 1-hour pulsations in Saturn's outer magnetosphere. Icarus, 271, 1–18. https://doi.org/10.1016/j.icarus.2016.01.025
Roussos, E., Krupp, N., Mitchell, D. G., Paranicas, C., Krimigis, S. M., Andriopoulou, M., Palmaerts, B., Kurth, W. S., Badman, S. V., Masters, A., & Dougherty, M. K. (2016). Quasi-periodic injections of relativistic electron in Saturn's outer magnetosphere. Icarus, 263, 101–116. https://doi.org/10.1016/j.icarus.2015.04.017
Sulaiman, A. H., Kurth, W. S., Hospodarsky, G. B., Averkamp, T. F., Persoon, A. M., Menietti, J. D., Ye, S.-Y., Gurnett, D. A., Pisa, D., Farrell, W. M., & Dougherty, M. K. (2018). Auroral hiss emissions during Cassini's grand finale: Diverse electrodynamic interactions between Saturn and its rings. Geophysical Research Letters, 45, 6782–6789. https://doi.org/10.1029/2018GL077875
Wu, C. S., & Lee, L. C. (1979). A theory of the terrestrial kilometric radiation. The Astrophysical Journal, 230, 621–626. https://doi.org/10.1086/157120
Xin, L., Gurnett, D. A., Santolik, O., Kurth, W. S., & Hospodarsky, G. B. (2006). Whistler-mode auroral hiss observed near Saturn's B ring. Journal of Geophysical Research, 111, A06214. https://doi.org/10.1029/2005JA011432
Yates, J. N., et al. (2016). Saturn's quasiperiodic magnetohydrodynamic waves. Geophysical Research Letters, 43, 11,102–11,111. https://doi.org/10.1002/2016GL071069