As you may or not be aware, we have a wonderful bubble created by the Sun. This Heliosphere (or bubble) protects us from plasma and other debris coming at us from the interstellar medium.
I have read a lot of threads on Dyson Shells and none seem to address what to do in the absence of our lovely Heliosphere.
Answers will be separated into two categories:
Dyson Shell proposals that allows for a Heliosphere to stay intact
Dyson Shell defense proposals.
NOTE: My ideal Dyson Shell is only about 3 million miles in radius (just over .03227 of an AU) due to heating and resource problems, as opposed to the typical 1 AU Dyson shell. The proposals do not have to take this size into account, but it is always a bonus.