Do Aura development rules exist?

Games Discussion Ars Magica
1

Are there any official rules on aura development?

Imagine a few young magi found a covenant in a Magic Aura of 2. Does the aura grow with time, because of all the magic used there? or does it diminish if "too much" vis is "drawn" from the aura?
Are there ways of "feeding" a magical aura?

Do the old covenants have strong auras because they used the best spots or because the aura grew)

2

They are in realms of power magic.

With respect to this set of optional rules the answer to each of your queries is "yes".

3

In addition to RoP:M, there are the rules in The Mysteries concerning Hermetic Architecture, and the way it can be used to boost auras.