THIS STUDY DEALS WITH MAGNETOSPHERIC SUBSTORMS WHICH ARE AMONG THE MOST DYNAMIC AND MOST COMMON SPACE WEATHER PHENOMENA. IT IS UNDISPUTED THAT SUBSTORMS ARE DRIVEN (ENERGIZED) BY THE INTERACTION OF THE SOLAR WIND (INCLUDING IMF) WITH THE MAGNETOSPHERE. HOWEVER MANY DETAILS ON HOW EXACTLY STILL NEED TO BE INVESTIGATED. ALTHOUGH TWO SUBSTORMS CAN BE SEPARATED IN TIME BY ANY AMOUNT OF TIME AN INTRIGUING AND IMPORTANT DISCOVERY WAS THAT THEY OFTEN OCCUR IN REPETITION OF THREE OR MORE WITH A RECURRENCE RATE AROUND 3 HOURS. MANY INVESTIGATIONS HAVE FOCUSED ON THIS PERIODIC BEHAVIOR. HOWEVER THERE IS RECENT STATISTICAL EVIDENCE IN THE LITERATURE THAT SUBSTORMS ALSO HAVE PERIODS AROUND 1 HOUR. THIS SHORTER PERIOD IS INTRIGUING AND IS CLEARLY NOT RELATED TO THE THREE-HOUR AVERAGE DURATION OF SUBSTORMS. OTHER MECHANISMS MUST PLAY A ROLE HERE BUT NO DETAILED INVESTIGATIONS EXIST SO FAR. OUR GOAL IS TO UNDERSTAND THIS UNEXPLORED PERIODIC BEHAVIOR OF THE MAGNETOTAIL IN RESPONSE TO SOLAR WIND COUPLING. WE WILL CHARACTERIZE THE 1-HR PERIODIC SUBSTORM/DIPOLARIZATION EVENTS AND WE WILL CONTRAST/COMPARE THEM WITH THE PROPERTIES OF 3-HR PERIODIC SUBSTORM EVENTS. THEN WE WILL ALSO MAKE A FIRST ATTEMPT AT IDENTIFYING THE 1-HR MECHANISM.