There is a fantastic website that contains pretty much everything you could possibly want to know about solar activity and it is put together with the needs of ham radio operators in mind. The site is SolarHam.com
Solarham is the loving effort of Kevin, VE3EN (who happened to be one of the participants in the successful CY9M DXpedition).
Kevin is currently raising funds to run SolarHam.com for 2013, and has turned this into his full-time vocation. Please consider supporting this wonderful website.