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We investigate whether the dipolarization process duringsawtooth events is global or not through an examination of the local timedistribution of the magnetic tilt angle (i.e. the angle between the Bvector and the equatorial plane in dipole VDH coordinates) atgeostationary orbit. From the statistical analysis of 207 individual teeth and212 isolated substorms, we find that individual teeth follow a dipolarizationpattern similar to that observed for isolated substorms. The dipolarization forindividual teeth initiates in the sector between 22:00 magnetic local time(MLT) and 00:00 MLT. Then the dipolarization expands both eastward andwestward. However, relative to isolated substorms, we find that the nightsidemagnetosphere is much more stretched prior to the onset, and the change of thetilt angle during the dipolarization process is much larger during individualteeth. The magnetic dipolarization is seen over a wider local time sectorduring individual teeth than during isolated substorms. However, the magneticdipolarization is rarely observed near local noon during individual teeth. Thissuggests that the magnetic dipolarization process during individual teeth isstill confined primarily to the nightside

A statistical study of magnetic dipolarization for sawtooth events and isolated substorms at geosynchronous orbit with GOES data