Hi Chris,

Lowell said it takes up to ten days at times before you see activity from the larger flares, but he does stress that repeated C Class Flares do also have an effect.

If you look at the D region map, it gives you a fairly good idea about what happens insofar as the intensity of the flares when they hit the Earth. I've seen C Class Flares that show far more results than a single X Class Flare, so it really does matter where the point of impact is and not so much the size of the flare itself.

I've been doing as close a watch as I can of late and have checked where the impacts occur regardless of C's or X's and I think if one catalogs these events regularly a better correlation might be achieved.

During the past week we had two solar events, both of them had fringes which extended inland in America as far as Kansas. One was a C and the other was an X. Yesterday Colorado got an earthquake in an area that is slightly active and we had the quake off of Oregon that was in the higher impact area also.

I don't have the time to track these as a professional person might as I have to many other projects in the works, but I do think a long term study with better tracking of the flares impacts and a ten day follow-up window might provide some interesting results.

Of course Lowell made this correlation many years ago, but as to papering the results I don't think he ever did. But its out there for an interested person.

Petra