Yates, JN;
Southwood, DJ;
Dougherty, MK;
Sulaiman, AH;
Masters, A;
Cowley, SWH;
Kivelson, MG;
... Coates, AJ; + view all
(2016)
Saturn's quasiperiodic magnetohydrodynamic waves.
Geophysical Research Letters
, 43
(21)
pp. 11102-11111.
10.1002/2016GL071069.
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Abstract
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.
| Type: | Article |
|---|---|
| Title: | Saturn's quasiperiodic magnetohydrodynamic waves |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/2016GL071069 |
| Publisher version: | http://doi.org/10.1002/2016GL071069 |
| Language: | English |
| Additional information: | © 2016. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | Science & Technology, Physical Sciences, Geosciences, Multidisciplinary, Geology, FIELD-ALIGNED CURRENTS, HYDROMAGNETIC-WAVES, ULF WAVES, MAGNETOSPHERE, PULSATIONS, RADIO, Saturn's magnetosphere; MHD waves; QP60; periodicity |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/1531492 |
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