I don't know much about the subject but I can Google "correlation coefficient" ;-)

I came up with this:

http://mathworld.wolfram.com/Correla...efficient.html

Lots of formulae which I don't understand but a couple of clicks down you'll find some graphs. If I've interpreted them correctly, the closer the coefficient is to one (1), the closer the relationship between the arrays.

0.09 looks fairly scattered on the scale of things but it could be much worse.

Hope this helps

Regards