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    Saturn's quasiperiodic magnetohydrodynamic waves

    Yates, J.N. and Southwood, D.J. and Dougherty, M.K. and Sulaiman, A.H. and Masters, A. and Cowley, S.W.H. and Kivelson, M.G. and Chen, C.H.K. and Provan, G. and Mitchell, D.G. and Hospodarsky, G.B. and Achilleos, Nick and Sorba, Arianna and Coates, Andrew J. (2016) Saturn's quasiperiodic magnetohydrodynamic waves. Geophysical Research Letters 43 (21), 11,102-11,111. ISSN 0094-8276.

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    Quasiperiodic ∼1 h fluctuations have been recently reported by numerous instruments on board the Cassini spacecraft. The interpretation of the sources of these fluctuations has remained elusive to date. Here we provide an explanation for the origin of these fluctuations using magnetometer observations. We find that magnetic field fluctuations at high northern latitudes are Alfvénic, with small amplitudes (∼0.4nT), and are concentrated in wave packets similar to those observed in Kleindienst et al. (2009). The wave packets recur periodically at the northern magnetic oscillation period. We use a magnetospheric box model to provide an interpretation of the wave periods. Our model results suggest that the observed magnetic fluctuations are second harmonic Alfvén waves standing between the northern and southern ionospheres in Saturn's outer magnetosphere.


    Item Type: Article
    School: Birkbeck Faculties and Schools > Faculty of Science > School of Natural Sciences
    Depositing User: Administrator
    Date Deposited: 08 Mar 2017 13:35
    Last Modified: 02 Aug 2023 17:30


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