Spherical standing acoustic waves in plasma

[Hal Hildebreand]

I was wondering if anyone out there can help me with some amateur
research I'm doing. I have been searching for any research into
acoustic standing waves in spherical particle flow plasmas. I can't
find much on this, rather finding things on acoustic standing waves in
a spherical membrane (i.e. spherical harmonics) - not what I'm looking
for. The system I'm examining is an magnetic-electrostatically
contained plasma. Spherical standing waves are generated by the
coupling of the radial and tangential ion waves in the plasma. The
effect was described in Robert Bussard's patent #5,160,695 on
"apparatus for creating and controlling nuclear fusion reactions".
It's an interesting effect, and I'm doing experiments regarding the
role of symmetry in the generated spherical standing waves.

The closest I've been able to find is an excellent paper on non-linear
standing and rotating waves on the sphere by Christoph Gugg
(http://tam.cornell.edu/THealey_nonlinear_waves.pdf)

Any pointers will be appreciated.

Thanks.