NASA/Marshall Solar PhysicsThe Sunspot Cycle (Updated 2017/03/15) Please note: Dr. David Hathaway, a member of the MSFC solar physics group for 29 years, transferred to NASA's Ames Research Center in California, and retired in December 2016. Dr. Hathaway is creating his own website, which will host sunspot cycle data and predictions. This link will take you away from this NASA site to Dr. Hathaway's new pages. Sunspot Numbe
