@article {2986,
	title = {Elliptical instability in rotating spherical fluid shells:application to Earth{\textquoteright}s fluid core},
	journal = {Physics of the Earth and Planetary Interiors},
	volume = {142},
	year = {2004},
	pages = { 257 {\textendash} 282},
	abstract = {If a circular flow of a contained rotating fluid is strained into an elliptical one in such a way that the elliptical streamlines\&nbsp;preserve their figures in \&nbsp;a laboratory reference frame, the flow becomes unstable. This type of instability is known to be\&nbsp;excited as a result of coupling between a pair of inertial modes of the contained fluid by the applied strain. The present \&nbsp;work\&nbsp;is concerned with the elliptical instability of a thick, spherical, \&nbsp;rotating fluid shell. We have conducted experiments and have\&nbsp;observed the excitation of the elliptical instability as well as some of the \&nbsp;inertial modes of a rotating fluid contained in the\&nbsp;above mentioned geometry. The velocities of the fluid particles are captured by means of \&nbsp;Digital Particle Imaging Velocimetry\&nbsp;(DPIV). Plots of the velocity vectors of the inertial modes obtained experimentally are used to identify the \&nbsp;modes predicted\&nbsp;using theoretical methods. Such investigations are of geophysical interest, since tidal forcing might be sufficient to excite an\&nbsp;elliptical instability in Earth{\textquoteright}s fluid core as well as in other planetary \&nbsp;interiors.},
	author = {Behnam Seyed-Mahmoud and Keith Aldridge and Gary Henderson}
}
