Imperial College London
Alternate

ProfessorMicheleDougherty

Faculty of Natural Sciences, Department of Physics

Head of Department of Physics, Professor of Space Physics
 
 
 
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Contact

 

+44 (0)20 7594 7770m.dougherty Website

 
 
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Assistant

 

Ms Lida Mnatsakanian +44 (0)20 7594 7503

 
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Location

 

Blackett 900aBlackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Provan:2015:10.1002/2015JA021642,
author = {Provan, G and Tao, C and Cowley, SWH and Dougherty, MK and Coates, AJ},
doi = {10.1002/2015JA021642},
journal = {Journal of Geophysical Research: Space Physics},
pages = {9524--9544},
title = {Planetary period oscillations in Saturn's magnetosphere: Examining the relationship between abrupt changes in behavior and solar wind-induced magnetospheric compressions and expansions},
url = {http://dx.doi.org/10.1002/2015JA021642},
volume = {120},
year = {2015}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We examine planetary period oscillations (PPOs) observed in Saturn's magnetospheric magnetic field data from the time of Saturn's equinox in 2009. In particular, we focus on the time period commencing February 2011, when the oscillations started to display sudden and unexpected changes in behavior at ~100–200 day intervals. These were characterized by large simultaneous changes in the amplitude of the northern and southern PPO systems, together with small changes in period and jumps in phase. Nine significant abrupt changes have been observed in the postequinox interval to date, commencing as the Sun started to emerge from a long extended solar minimum. We perform a statistical study to determine whether these modulations in PPO behavior were associated with changes in the solar and/or upstream solar wind conditions. We report that the upstream solar wind conditions show elevated values of solar wind dynamic pressure and density around the time of PPO behavioral transitions, as opposed to before and after these times. We suggest that abrupt changes in PPO behavior may be related to significant changes in the size of the Saturnian magnetosphere in response to varying solar wind conditions.
AU  - Provan,G
AU  - Tao,C
AU  - Cowley,SWH
AU  - Dougherty,MK
AU  - Coates,AJ
DO  - 10.1002/2015JA021642
EP  - 9544
PY  - 2015///
SN  - 2169-9402
SP  - 9524
TI  - Planetary period oscillations in Saturn's magnetosphere: Examining the relationship between abrupt changes in behavior and solar wind-induced magnetospheric compressions and expansions
T2  - Journal of Geophysical Research: Space Physics
UR  - http://dx.doi.org/10.1002/2015JA021642
UR  - http://hdl.handle.net/10044/1/38578
VL  - 120
ER  -
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