I watched this blender guru tutorial on Making Fire. Around 34:00 he starts explaining how to use a particle system to create "fireflies". The result is something like this
Now I have this idea to create a "burning earth". For this I have a UV sphere inside the earth as an emitter of fire and smoke. And the smoke domain is placed like this.
This results in an image like this.
So far so good. But when I add a particle system to my "emitter sphere" the whole sphere is emitting fireflies and I want only fireflies around my fire. I thought to solve that by creating a circle under the fire and add a particle system to that circle. But how to get this working like that the circle emits fireflies that are driven upwards by the smoke domain ??
I guess (with hindsight) this question is a possible duplicate for this question How can I control where smoke and fire are emitted from? but I think because my question is specific for the Particle System it adds new knowledge to Blender SE