Adding an effect to a planet

Another Question from me

effects in gravity wells are linked with nullMeshParticleEffect parameter see wormholes etc.

now i tried to add an effect to an entity with a planet mesh. But my effect does not show up.

Here my test:

meshName "Proto_Planet_Desert_S1_0"
cloudColor ffe7c362
nullMeshRadius 0.000000
nullMeshParticleEffect "mytest"

Is it possible to add a nullmesh effect if a mesh is referenced?

I tried nullMeshRadius up to 20000 and nothing happens.

In Particle Forge my effect show fine and I also included my planets mesh to scale the effect to the planets size.

Or is there another way to add an effect (not with nullmesh)?